Singular

Plural

Acetabulum

Acetabula

Addendum

Addenda

Adnexum

Adnexa

Algal

Algae

Alto

Altos

Alumna

Alumnae

Alumnus

Alumni

Alveolus

Alveoli

Ameba

Amebas

Amicus curiae

Amici curiae

Analysis

Analyses

Anastomosis

Anastomoses

Antrum

Antra

Apex

Apices

Aponeuroses

Aponeuroses

Appendix

Appendices, appendixes

Areola

Areolae

Artery

Arteries

Arthritis

Arthritides

Atrium

Atria

Axilla

Axillae

Bacillus

Bacilli

Bacterium

Bacteria

Base

Bases

Basis

Bases

Bona fide

boa fides

Bon vivant

Bons vivant

Bronchus

Bronchi

Brucellosis

Brucelloses

Bulla

Bullae

Bursa

Bursae

Calculus

Calculi

Calix

Calices

Calyx

Calyces

Canthus

Canthi

Carcinoma

Carcinomata, carcinomas

Catharsis

Catharses

Cervix

Cervices, cervixes

Cicatrix

Cicatrices

Coccus

Cocci

Comedo

Comedones

Compendium

Compendiums

Conjunctiva

Conjunctivae

Cornea

Corneae, corneas

Cornu

Cornua

Corpus

Corpora

Cortex

Cortices

Crisis

Crises

Cranium

Crania

Criterion

Criteria

Crux

Cruxes

Datum

Data

Diagnosis

Diagnoses

Dialysis

Dialyses

Dictum

Dicta

Diverticulum

Diverticula

Ecchymosis

Ecchymoses

Embolus

Emboli

Embryo

Embryos

Encephalitis

Encephalitides

Exegesis

Exegesis

Enteritis

Enteritides

Epididymis

Epididymides

Exostosis

Exostoses

Femur

femurs, femora

Fibula

Fibulas

Fimbria

Fimbriae

Fistula

Fistulae, fistulas

Focus

Foci

Foramen

Foramina

Fornix

Fornices

Fossa

Fossae

Fundus

Fundi

Ganglion

Ganglia

Genius

Geniuses

Genus

Genera

Gyrus

Gyri

Helix

Helices

Hernia

herniae, hernias

Hilum

Hila

Humerus

Humeri

Ileum

Ilea

Ilium

Ilia

Index

Indexes

Ischium

Ischia

Keratosis

Keratoses

Labium

Labia

Lacuna

Lacunae

Lamina

Laminae

Larva

Larvae

Larynx

Larynges

Leiomyoma

Leiomyomata

Locus

Loci

Lumen

Lumina , lumens

Madam

Mesdames

Matrix

Matrices

Maxilla

Maxillae

Maximum

Maxima

Meatus

Meatuses

Media

Mediae

Medium

Media

Medulla

Medullae

Meningitis

Meningitides

Miasma

Miasmas

Milieu

Milieux , milieus

Millennium

Millennia

Mitosis

Mitoses

Mucosa

Mucosae

Neurosis

Neuroses

Nucleus

Nuclei

Mycelium

Mycelia

Naris

Nares

Nevus

Nevi

Nucleus

Nuclei

Optimum

Optima

Os

Ora (pertaining to mouth)

Os

Ossa (pertaining to bones)

Ovary

Ovaries

Ovum

Ova

Papilla

Papillae

Paralysis

Paralyses

Pelvis

Pelves

Petechia

Petechiae

Phalanx

Phalanges

Phenomenon

Phenomena

Placebo

Placebos

Pleura

Pleurae

Plexus

Plexuses

Pons

Pontes

Prognosis

Prognoses

Prospectus

Prospectuses

Prosthesis

Prostheses

Protozoon

Protozoa

Proviso

Provisos

Psychosis

Prostheses

Protozoon

Protozoa

Proviso

Provisos

Psychosis

Psychoses

Pubis

Pubes

Pudendum

Pudenda

Pupa

Pupae

Quantum

Quanta

Quorum

Quorums

Radius

Radii

Ratio

Rations

Residuum

Residua

Rhinoplasty

Rhinoplasties

Rhonchus

Rhonchi

Ruga

Rugae

Sarcoma

Sarcomata, sarcomas

Sclera

Sclerae

Sclerosis

Scleroses

Sepsis

Sepses

Septum

Septa

Sequel

Sequels

Sequela

Sequelae

Serum

Septa

Sequel

Sequels

Sequela

Sequels

Serum

Sera

Sinus

Sera

Sinus

Sinuses

Spermatozoon

Spermatozoa

Sputum

Sputa

Sternum

Sternums

Stigma

Stigmata

Stimulus

Stimuli

Stoma

Stomata, stomas

Stratum

Strata

Sulcus

Sulci

Surgeon

Surgeons

Syllabus

Syllabi

Symposium

Symposia

Synopsis

Synopses

Testis

Testes

Therapy

Therapies

Thesis

Theses

Thorax

Thoraces

Trachea

Tracheae

Ulna

Ulnas

Ureter

Ureters

Urethra

Urethras

Urinalysis

Urinalyses

Uterus

Uteri

Uvula

Uvulas

Vas

Vasa

Vena cava

Venae cavae

Verruca

Verrucae

Vertebra

Vertebrae

Vesicle

Vesicles

Villus

Villi

Virus

Viruses

Viscus

Viscera

Zygion

Zygia