is

es ex. diagnosis> diagnoses

um

a ex. bacterium> bacteria

us

i (sometimes era/ora) ex. bronchus> bronchi

a

ae ex. vetebra> vertebrae

ix

ices ex. appendix> appendices

ex

ices ex. cortex> cortices

ax

aces ex. thorax> thoraces

ma

s or mata ex. carcinoma> carcinomas or carcinomata

on

a ex. protozoon> protozoa

nx

nges ex. larynx> larynges