Vocabulary: Irregular Plurals

SINGULAR
analysis
bacterium
basis
child
crisis
criterion
curriculum
datum
diagnosis
fish
focus
foot
hypothesis
index
man
means
medium
mouse
ox
parenthesis
phenomenon
series
sheep
species
stimulus
syllabus
thesis
tooth
woman

PLURAL
analyses
bacteria
bases
children
crises
criteria
curricula
data
diagnoses
fish/fishes
foci/focuses
feet
hypotheses
indices/indexes
men
means
media
mice
oxen
parentheses
phenomena
series
sheep
species
stimuli
syllabi/syllabuses
theses
teeth
women

alumnus
antenna
appendix
axis
deer
ellipsis
formula
fungus
goose
louse
nucleus
matrix
oasis
paralysis
radius
stratum
synthesis
synopsis
vertebra
vita

alumni
antennae/antennas
appendices
axes
deer/deers
ellipses
formulae/formulas
fungi/funguses
geese
lice
nuclei
matrices
oases
paralyses
radii
strata
syntheses
synopses
vertebrae
vitae