Bravo Reference: Unusual Plurals Compiled by  Sam C. Chan

First Published: June 3, 2005
Last Updated: July 11, 2007

This is a list of most common used irregular English plural forms. They are based on my own personal usageónot exhaustive research or survey, and is not meant to be a complete list.

Rarely Known Somewhat Unknown Commonly Known
medium media
alumnus alumni
alumna alumnae
opus opera
forum fora
corpus corpora*
datum data
addendum addenda
curriculum curricula
analysis analyses
basis bases
focus foci
supernova supernovae
criterion criteria
phenomenon phenomena
antenna antennae
formula formulae
index indices
appendix appendices
stimulus stimuli
bureau bureaux/bureaus
die dice
apparatus apparatuses
(oft-misspelled as apparati)
leaf leaves
child children
goose geese
ox oxen
mouse mice
foot feet
tooth teeth
man men
woman women
knife knives
wife wives

*when used as a linguistic term, the plural form is "corpuses"


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