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criterion - Answers criteria
phenomenon - Answers phenomena
analysis - Answers analyses
basis - Answers bases
emphasis - Answers emphases
exegesis - Answers exegeses
Hypothesis - Answers hypotheses
prognosis - Answers prognoses
synthesis - Answers syntheses
carcinoma - Answers carcinomata
miasma - Answers miasmata
trauma - Answers traumata
addendum - Answers addenda
atrium - Answers atria
curriculum - Answers curricula
erratum - Answers errata
gymnasium - Answers gymnasia
memorandum - Answers memoranda
millennium - Answers millennia
rostrum - Answers rostra
spectrum - Answers spectra
bacillus - Answers bacilli
calculus - Answers calculi
colossus - Answers colossi
fungus - Answers fungi
gladiolus - Answers gladioli
locus - Answers loci
radius - Answers radii
terminus - Answers termini
alga (usually used in the plural) - Answers algae
alumna - Answers alumnae
antenna - Answers antennae
lacuna - Answers lacunae
larva - Answers larvae
nebula - Answers nebulae
codex - Answers codices
matrix - Answers matrices
vertex - Answers vertices
vortex - Answers vortices
calyx - Answers calyces
crux - Answers cruces
corpus - Answers copora
genus - Answers genera
opus - Answers opera
species - Answers species