Other loan nouns

Loans of Latin origin

Loans of Greek origin

Singular	Plural
-is [ɪs] basis crisis analysis thesis parenthesis axis hypothesis diagnosis   -on [ǝn] criterion phenomenon -а [ǝ] miasma	-es [i:z] bases crises analyses theses parentheses axes hypotheses diagnoses   -а [ǝ] criteria phenomena -ata [ǝtǝ] miasmata

-us [ǝs]     stimulus nucleus radius corpus genus   -а [ǝ] formula antenna vertebra -um [ǝm] datum stratum erratum   -es,-ix [ɪks] index appendix matrix

-i [ai] -ога [ǝrǝ] -era [ǝrǝ] stimuli nuclei radii corpora genera -ае [i:] formulae (or regular - formulas) antennae vertebrae   -a [ǝ] data strata errata   -ices [ɪsi;z] indices appendices matrices

[i:z] or indexes or appendixes or matzixes

Fr. -ean [ou] tableau bureau   It.-o[ou] tempo

-eaux [ouz] tableaux bureaux (or bureaus)   -i [i] tempi (or tempos)

As can be seen from the above list some loan nouns may have two plural forms: the English plural and the original foreign one:

memorandum	memoranda memorandums	focus	foci focuses
curriculum	curricula curriculums
formula	formulae formulas
cherub	cheribum cherubs

There is a tendency to use the regular English plural forms in fiction and colloquial English and the foreign plural in academic or learned language.

Sometimes different plural forms have different meanings:

index	indexes (list of contents of books) indices (a mathematical term - показатель)
genius	geniuses (men of talent) genii (fabulous spirits guarding a place - духи, домовые)

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