150 Examples of the Correct Plural of Appendix Explained

When people learn English, one of the confusing parts is dealing with words that come from Latin. The word appendix is a good example. Many learners are not sure if the plural is appendices or appendixes. Both forms are correct, but the right choice depends on the setting where the word is used. To understand this better, we need to look at history, meaning, and actual usage in daily life. By the end of this article, you will see 150 examples of appendix in plural form that will make everything clear.

The word appendix has two main meanings. In medicine, it refers to the small organ in the body that can become inflamed and cause appendicitis. In books, it means the extra section at the end where details, references, or notes are given. Because it is a Latin word, the original plural was appendices. Over time, modern English accepted appendixes as well. Both are correct, but one is more common in academic writing, while the other is often used in medicine and general English.

Medical Terms

Word	Meaning	Example
Appendices	Plural of appendix in books	The report had three appendices.
Appendixes	Plural of appendix in medicine	Doctors studied inflamed appendixes.
Diagnoses	Plural of diagnosis	Several diagnoses were confirmed.
Prognoses	Plural of prognosis	The doctors gave different prognoses.
Thrombi	Plural of thrombus	The patient had two thrombi.
Alveoli	Plural of alveolus	The lungs contain many alveoli.
Bronchi	Plural of bronchus	Smoke damages the bronchi.
Emboli	Plural of embolus	Two emboli blocked blood flow.
Papillae	Plural of papilla	The tongue has many papillae.
Nuclei	Plural of nucleus	Cells contain different nuclei.

Book and Literature

Word	Meaning	Example
Appendices	Extra material at end of book	The book contained two appendices.
Indexes	Lists at end of books	The indexes were helpful.
Indices	Plural of index in math	Economists studied price indices.
Bibliographies	Lists of references	Students wrote bibliographies.
Footnotes	Notes at bottom of page	The author added many footnotes.
Endnotes	Notes placed at end	The research used endnotes.
Glossaries	Lists of word meanings	Glossaries helped readers.
Prefaces	Introductions to books	Many prefaces explained context.
Forewords	Opening comments in books	Authors often add forewords.
Chapters	Main divisions in books	The book had twenty chapters.

Science

Word	Meaning	Example
Appendices	Added scientific sections	The appendices had charts.
Formulae	Plural of formula	Chemists used three formulae.
Formulas	Modern plural of formula	Students solved formulas.
Hypotheses	Plural of hypothesis	Two hypotheses were tested.
Analyses	Plural of analysis	Data analyses confirmed results.
Criteria	Plural of criterion	Three criteria were used.
Phenomena	Plural of phenomenon	Strange phenomena occurred.
Spectra	Plural of spectrum	Light produces spectra.
Gases	Plural of gas	The experiment used gases.
Theories	Plural of theory	Physics has many theories.

History and Law

Word	Meaning	Example
Appendices	Extra historical notes	The historian added appendices.
Statutes	Written laws	Statutes governed the land.
Decrees	Official orders	The king issued decrees.
Charters	Documents of rights	Towns received charters.
Manuscripts	Old hand-written texts	Manuscripts were preserved.
Treaties	Agreements between states	Nations signed treaties.
Cases	Legal disputes	The lawyer studied cases.
Verdicts	Decisions in court	The jury gave verdicts.
Amendments	Legal changes	Amendments updated the law.
Codes	Systems of law	The country followed codes.

Everyday English

Word	Meaning	Example
Appendices	Extra information	The appendices gave details.
Appendixes	Medical parts	The doctors removed appendixes.
Boxes	Plural of box	The boxes were full.
Buses	Plural of bus	The buses arrived late.
Tomatoes	Plural of tomato	Tomatoes are fresh today.
Potatoes	Plural of potato	Farmers sold potatoes.
Watches	Plural of watch	The shop sells watches.
Shoes	Plural of shoe	She wore red shoes.
Phones	Plural of phone	Phones rang loudly.
Houses	Plural of house	The street had many houses.

Technology

Word	Meaning	Example
Appendices	Extra sections in manuals	The appendices had diagrams.
Databases	Collections of data	Companies store data in databases.
Algorithms	Step-by-step procedures	Algorithms power search engines.
Devices	Electronic tools	Devices connect people.
Networks	Linked systems	Networks share information.
Servers	Computers that serve data	Servers crashed during peak time.
Programs	Sets of instructions	Programs were updated.
Files	Stored documents	Files filled the drive.
Apps	Applications for phones	Apps help with banking.
Codes	Instructions in symbols	Programmers wrote codes.

Mathematics

Word	Meaning	Example
Appendices	Extra math notes	The appendices explained proofs.
Equations	Statements of equality	Students solved equations.
Variables	Symbols for numbers	Variables changed values.
Graphs	Visual displays of data	Graphs showed trends.
Theorems	Proven statements	Theorems guided proofs.
Matrices	Plural of matrix	Matrices solved systems.
Matrixes	Modern plural of matrix	The software handled matrixes.
Functions	Mathematical relations	Functions linked inputs and outputs.
Logarithms	Mathematical operations	Logarithms simplified calculations.
Derivatives	Calculus results	Derivatives measure rates.

Environment

Word	Meaning	Example
Appendices	Extra reports	Appendices covered pollution.
Forests	Large wooded areas	Forests provide oxygen.
Rivers	Flowing water bodies	Rivers cross continents.
Lakes	Large water bodies	Lakes are fresh sources.
Oceans	Vast saltwater bodies	Oceans cover the earth.
Species	Groups of organisms	Species face extinction.
Ecosystems	Interacting communities	Ecosystems balance life.
Mountains	Large landforms	Mountains rise high.
Deserts	Dry land areas	Deserts lack rain.
Valleys	Low land areas	Valleys hold rivers.

Education

Word	Meaning	Example
Appendices	Extra school notes	Teachers gave appendices.
Lessons	Teaching sessions	The lessons were fun.
Exams	Tests of knowledge	Exams start tomorrow.
Essays	Written works	Essays were graded.
Students	Learners in school	Students studied hard.
Teachers	Guides in education	Teachers explained well.
Subjects	Areas of study	Subjects included math.
Grades	Marks given	Grades improved.
Classes	Groups of learners	Classes ended late.
Libraries	Buildings with books	Libraries store knowledge.

Business

Word	Meaning	Example
Appendices	Extra reports in contracts	Appendices clarified terms.
Companies	Business organizations	Companies grew fast.
Markets	Places of trade	Markets opened early.
Profits	Gains after costs	Profits increased.
Losses	Opposite of profits	Losses fell.
Deals	Business agreements	Deals were signed.
Contracts	Written agreements	Contracts were renewed.
Shares	Units of ownership	Shares were sold.
Managers	People in charge	Managers led teams.
Employees	Workers in firms	Employees worked late.

Medicine

Word	Meaning	Example
Appendixes	Medical usage of appendix	Doctors studied appendixes.
Viruses	Infectious agents	Viruses spread quickly.
Bacteria	Microscopic organisms	Bacteria cause illness.
Fungi	Spore-producing organisms	Fungi grew in damp areas.
Organs	Body parts	Organs function together.
Bones	Hard body parts	Bones support the body.
Muscles	Tissues for movement	Muscles contract.
Cells	Basic life units	Cells divide often.
Hormones	Chemical messengers	Hormones control growth.
Vaccines	Medicines for immunity	Vaccines prevent disease.

Geography

Word	Meaning	Example
Appendices	Extra maps	Appendices showed borders.
Countries	Political territories	Countries signed treaties.
Cities	Urban areas	Cities grew fast.
Villages	Small settlements	Villages were peaceful.
Islands	Land surrounded by water	Islands attract tourists.
Peninsulas	Land surrounded on three sides	Peninsulas extend into seas.
Continents	Largest landmasses	Continents shape earth.
Capitals	Main cities	Capitals lead nations.
Borders	Dividing lines	Borders separate lands.
Regions	Large areas	Regions differ in climate.

Literature

Word	Meaning	Example
Appendices	Added material	Appendices gave detail.
Poems	Pieces of verse	Poems expressed feelings.
Novels	Long stories	Novels entertained readers.
Stories	Narratives	Stories inspired children.
Plays	Dramatic works	Plays filled theaters.
Dramas	Serious plays	Dramas moved audiences.
Characters	Figures in stories	Characters shaped plots.
Themes	Central ideas	Themes guided novels.
Symbols	Representations	Symbols carried meaning.
Genres	Types of literature	Genres classify works.

Technology (Advanced)

Word	Meaning	Example
Appendices	Added technical notes	Appendices had charts.
Robots	Machines that act	Robots clean homes.
Sensors	Devices that detect	Sensors measured heat.
Chips	Small circuits	Chips powered devices.
Circuits	Electric pathways	Circuits carried current.
Screens	Display surfaces	Screens lit brightly.
Satellites	Space devices	Satellites orbit earth.
Rockets	Space vehicles	Rockets launched fast.
Cables	Wires for power	Cables carried energy.
Drones	Remote flying devices	Drones captured views.

Mixed Words

Word	Meaning	Example
Appendices	General extra notes	Appendices added data.
Dogs	Domestic animals	Dogs bark loudly.
Cats	Small pets	Cats slept.
Birds	Flying animals	Birds sang.
Trees	Large plants	Trees gave shade.
Flowers	Blooming plants	Flowers smelled sweet.
Stars	Celestial bodies	Stars twinkled.
Moons	Natural satellites	Moons orbit planets.
Planets	Large bodies in space	Planets move in orbits.
People	Human beings	People gathered.

Final Thoughts

The word appendix has two correct plural forms: appendices and appendixes. Both are accepted in English, but the choice depends on whether you are dealing with books or medicine. The best way to master it is by looking at real examples and practicing them in sentences. This is why the 150 examples of appendix in plural form given above are so helpful for learners.

By learning the rules and seeing the differences in action, you can write and speak more confidently. The more you use the word in real contexts, the more natural it will feel. Understanding Latin-based like Plural of Appendix, index, and matrix will also make your English sound more advanced and accurate.