130 Essential Science Words That Start With E

Science has many words starting with the letter E. These words are used in physics, chemistry, biology, mathematics, and environmental Science Words That Start With E. Learning them can make studying easier and help you understand complex topics. Some of these words are common, while others are used in advanced research.

This guide will give you 130 science words that start with E, their meanings, and examples. You will also see them grouped by school grade level and subject. This will help you learn them step by step and use them in the right context.

Biology Science Words That Start With E

Word	Meaning	Example
Ecology	Study of how living things interact with their environment	Ecology shows how animals depend on plants.
Embryo	Early stage of development in plants and animals	A plant embryo is inside the seed.
Enzyme	Protein that speeds up chemical reactions	Enzymes help digest food.
Eukaryote	Organism with cells having a nucleus	Humans are eukaryotes.
Endoplasm	Inner part of cell cytoplasm	The endoplasm supports cell parts.
Endangered	At risk of becoming extinct	Tigers are endangered animals.
Epidermis	Outer layer of skin in animals and plants	The epidermis protects the body.
Epigenetics	Study of changes in gene activity	Epigenetics explains how lifestyle affects DNA.
Ecosystem	Community of living and nonliving things	A forest ecosystem has trees, animals, and soil.
Evolution	Change of species over time	Evolution explains how whales came from land animals.

Physics Science Words That Start With E

Word	Meaning	Example
Energy	Power to do work	Solar panels make energy from sunlight.
Electron	Negatively charged particle in atoms	An electron moves around the nucleus.
Elasticity	Ability of material to return to shape	Rubber has high elasticity.
Equilibrium	State of balance	A balanced seesaw is in equilibrium.
Electricity	Flow of electric charge	Electricity lights homes.
Electromagnetism	Interaction of electricity and magnetism	Electromagnetism is used in motors.
Emission	Release of energy or particles	Stars give off light emissions.
Ecliptic	Path of the sun through the sky	The planets move along the ecliptic.
Electrostatics	Study of stationary electric charges	Static hair is caused by electrostatics.
Eigenvalue	Special number in math and physics	Eigenvalues are used in quantum mechanics.

Chemistry Science Words That Start With E

Word	Meaning	Example
Ester	Compound with a sweet smell	Esters make fruits smell nice.
Electrolyte	Substance that conducts electricity in solution	Sports drinks have electrolytes.
Emulsion	Mixture of two liquids that don’t mix	Milk is an emulsion of water and fat.
Endothermic	Process that absorbs heat	Melting ice is endothermic.
Equilibration	Process of reaching balance	Chemical reactions reach equilibration over time.
Electrophoresis	Lab method for separating molecules	DNA is studied using electrophoresis.
Element	Pure substance with one type of atom	Gold is a chemical element.
Enthalpy	Heat content of a system	Enthalpy changes during reactions.
Effervescence	Bubbling from gas release	Effervescence happens when soda is opened.
Exothermic	Process that gives off heat	Burning wood is exothermic.

Environmental Science Words That Start With E

Word	Meaning	Example
Environment	Surroundings of living things	The environment affects animal survival.
Emissions	Substances released into air or water	Factory emissions harm air quality.
Erosion	Wearing away of land	Rain causes soil erosion.
Ecotourism	Tourism that supports conservation	Ecotourism protects wildlife areas.
Eutrophication	Excess nutrients in water causing plant growth	Eutrophication kills fish in lakes.
Endemic	Found only in one place	Kangaroos are endemic to Australia.
Earthquake	Shaking of the ground	Earthquakes happen when tectonic plates move.
Evaporation	Change of liquid to gas	Puddles dry by evaporation.
Equator	Line dividing Earth in two halves	The equator passes through Ecuador.
Ecosystem Services	Benefits from nature to humans	Forests provide ecosystem services like clean air.

Mathematics & Data Science Words That Start With E

Word	Meaning	Example
Equation	Statement showing equality	3 + 2 = 5 is an equation.
Exponent	Number showing repeated multiplication	2³ means 2 × 2 × 2.
Estimation	Rough calculation	The teacher asked for an estimation of time.
Eigenvector	Special vector linked to eigenvalue	Eigenvectors are used in data analysis.
Error	Difference between measured and true value	The experiment had a small error.
Expected Value	Average result in probability	The expected value of a fair die roll is 3.5.
Even Number	Number divisible by two	Four is an even number.
Extrema	Highest or lowest values in math	The curve has two extrema.
Exponential	Rapid growth rate	Population can grow exponentially.
Ellipse	Oval shape in geometry	Planetary orbits are ellipses.

Earth Science Words That Start With E

Word	Meaning	Example
Earth	Our planet	Earth is the third planet from the Sun.
Earthquake	Sudden shaking of ground	Japan experiences many earthquakes.
Eruption	Release of lava from volcano	The eruption destroyed nearby villages.
Erosion	Wearing away of land	Wind erosion shapes deserts.
Equator	Imaginary middle line of Earth	Day and night are equal at the equator.
Elevation	Height above sea level	Denver has high elevation.
Estuary	Area where river meets sea	Fish breed in estuaries.
Epicenter	Point on surface above earthquake origin	The epicenter was near the coast.
Environment	Surrounding natural world	Protecting the environment is important.
Evapotranspiration	Water transfer from land to air	Plants release water through evapotranspiration.

Medical & Health Science Words That Start With E

Word	Meaning	Example
Epidemiology	Study of disease spread	Epidemiology helps track flu outbreaks.
Endocrine	System of hormone-making glands	The endocrine system controls growth.
Edema	Swelling from fluid build-up	Edema can occur after injury.
Endoscope	Tube for looking inside the body	Doctors use an endoscope in surgery.
Erythrocyte	Red blood cell	Erythrocytes carry oxygen.
Encephalitis	Inflammation of the brain	Encephalitis can be life-threatening.
Embolism	Blockage in blood vessel	An embolism can cause a stroke.
Electrocardiogram	Test of heart activity	The doctor checked the ECG results.
Enamel	Hard coating on teeth	Enamel protects teeth from decay.
Euthanasia	Ending life to relieve suffering	Euthanasia is debated in medical ethics.

Astronomy & Space Science Words That Start With E

Word	Meaning	Example
Eclipse	Blocking of light by one object in space	A solar eclipse happens when the Moon blocks the Sun.
Exoplanet	Planet outside our solar system	Scientists discovered a new exoplanet.
Extraterrestrial	From outside Earth	The search for extraterrestrial life continues.
Equinox	Day and night are equal in length	The equinox happens twice a year.
Ecliptic	Path the Sun appears to take in the sky	Planets move along the ecliptic.
Escape Velocity	Speed needed to leave a planet’s gravity	Rockets must reach escape velocity.
Europa	Moon of Jupiter with ice-covered ocean	Europa may have life under its ice.
Event Horizon	Edge of a black hole	Nothing escapes the event horizon.
Earthshine	Sunlight reflected from Earth to the Moon	Earthshine makes the dark part of the Moon glow.
Ejecta	Material thrown out by an impact	Craters on the Moon are surrounded by ejecta.

Engineering & Technology Words That Start With E

Word	Meaning	Example
Ergonomics	Designing tools for human comfort	The chair was built with good ergonomics.
Efficiency	Output compared to input	Solar panels improve energy efficiency.
Encoder	Device that changes information into code	Encoders help robots navigate.
Extrusion	Shaping material by forcing it through a die	Plastic pipes are made by extrusion.
Electromechanical	Combining electrical and mechanical parts	Elevators use electromechanical systems.
Encryption	Coding data for security	Bank transactions use encryption.
Excavator	Machine for digging	Excavators are used in construction.
Electronics	Study of electric circuits	Electronics power modern devices.
Emitter	Device that gives off signals or particles	An LED is a light emitter.
Ethernet	Technology for computer networking	The office computers are linked by Ethernet.

Geology & Earth Processes Words That Start With E

Word	Meaning	Example
Erosion	Wearing away of rock or soil	Waves cause coastal erosion.
Epicenter	Point on Earth above earthquake origin	The epicenter was in the mountains.
Extrusive	Igneous rock formed above ground	Basalt is an extrusive rock.
Earthquake	Shaking of the ground	A strong earthquake hit the city.
Eon	Longest division of geologic time	Dinosaurs lived millions of years ago in a past eon.
Evaporite	Mineral left after water evaporates	Rock salt is an evaporite.
Elastic Rebound	Sudden release of stored strain in rocks	Elastic rebound causes earthquakes.
Equigranular	Rock with crystals of the same size	Granite can be equigranular.
Escarpment	Steep slope or cliff	The escarpment divides the plateau from the plain.
Earthflow	Slow downhill movement of soil	Heavy rain triggered an earthflow.

Oceanography & Marine Science Words That Start With E

Word	Meaning	Example
Estuary	Where a river meets the sea	Estuaries are rich in wildlife.
Eddy	Circular movement of water	A small eddy formed behind the rock.
Euphotic Zone	Sunlit upper layer of ocean	Photosynthesis happens in the euphotic zone.
Ebb Tide	Tide going out to sea	Fishing is good during ebb tide.
Eutrophication	Excess nutrients in water	Eutrophication harms fish populations.
Ekman Transport	Water movement due to wind and Earth’s rotation	Ekman transport moves surface currents.
Epipelagic	Top layer of the ocean	Many fish live in the epipelagic zone.
Epibenthic	Living on the ocean floor surface	Crabs are epibenthic creatures.
Exoskeleton	Hard outer shell of marine animals	Lobsters have an exoskeleton.
Echinoderm	Marine animal with radial symmetry	Starfish are echinoderms.

Botany & Plant Science Words That Start With E

Word	Meaning	Example
Evergreen	Plant that keeps leaves all year	Pine trees are evergreen.
Endosperm	Tissue inside seeds that feeds the embryo	Wheat grains have starchy endosperm.
Epidermis	Outer layer of plant or animal	The leaf epidermis protects it from water loss.
Exine	Outer layer of pollen grain	The exine protects pollen during travel.
Epicotyl	Part of seedling above seed leaves	The epicotyl grows into the stem.
Ethylene	Plant hormone for fruit ripening	Ethylene makes bananas ripen faster.
Elaiosome	Seed part that attracts ants	Elaiosomes help seed dispersal.
Embryophyte	Land plant with embryos	Mosses are embryophytes.
Epiphyte	Plant that grows on another plant	Orchids are epiphytes.
Endophyte	Microbe living inside a plant	Some fungi are endophytes.

Zoology & Animal Science Words That Start With E

Word	Meaning	Example
Ecdysis	Shedding of an outer layer	Snakes go through ecdysis.
Echolocation	Using sound to locate objects	Bats find food using echolocation.
Endotherm	Warm-blooded animal	Birds are endotherms.
Exoskeleton	Hard outer body covering	Crabs have exoskeletons.
Estivation	Dormancy during hot weather	Some snails go into estivation.
Eutherian	Placental mammal	Humans are eutherians.
Entomology	Study of insects	Entomology includes learning about bees.
Epibiont	Animal living on another animal	Barnacles are epibionts on whales.
Erythrocyte	Red blood cell	Erythrocytes carry oxygen in mammals.
Eel	Long fish-like animal	Electric eels can produce electric shocks.

Conclusion

Science words starting with E cover topics from atoms to ecosystems. They are used in school lessons, research, and everyday science news.

Learning them improves your science vocabulary and makes studying easier. Keep practicing and you’ll understand more complex topics over time.