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Nouns that keep their Latin or Greek form in the plural.
Singular
Plural
-is -es Greek
thesis
theses
hypothesis hyptes
hypotheses
crisis
crises
analysis
analyses
basis
bases
diagnosis
diagnoses
-on
-a Greek
phenomenon
phenomena
criterion
criteria
-ex, ix -ices Latin
index
indices
appendix
appendices
matrix = matris
matrices, matrixes
-us
-i Latin
stimulus
stimuli
nucleus
nuclei
syllabus (studieplan, läroplan)
syllabi
focus
foci
fungus
fungi
bacillus = bacill
bacilli
radius = radie
radii
cactus
cacti
-um
-a Latin
curriculum = studieplan
curricula, curriculums
memorandum = promemoria
memoranda, memorandums
referendum = folkomröstning
referenda, referendum
datum
data
forum
fora