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4. A number of foreign (particularly Latin and Greek) nouns have retained their original plural endings.
Loans of Greek origin
Singular
Plural
-is [?s]
basis
crisis
analysis
thesis
parenthesis
axis
hypothesis
diagnosis
-on [?n]
criterion
phenomenon
- [?]
miasma
-es [i:z]
bases
crises
analyses
theses
parentheses
axes
hypotheses
diagnoses
- [?]
criteria
phenomena
-ata [?t?]
miasmata
Loans of Latin origin
-us [?s]
stimulus
nucleus
radius
corpus
genus
- [?]
formula
antenna
vertebra
-um [?m]
datum
stratum
erratum
-es,-ix [?ks]
index
appendix
matrix
-i [ai]
- [?r?]
-era [?®?]
stimuli
nuclei
radii
corpora
genera
- [i:]
formulae (or regular - formulas)
antennae
vertebrae
-a [?]
data
strata
errata
-ices [?si;z]
indices
appendices
matrices
[i:z]
or indexes
or appendixes
or matzixes
Other loan nouns
Fr. -ean [ou]
tableau
bureau
It.-o [ou]
tempo
-eaux [ouz]
tableaux
bureaux (or bureaus)
-i [i]
tempi (or tempos)
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