Terminus
Terminus, radius, alumnus, and some other words ending in us, form
their plurals by changing the termination us into i; as termini,
radii, etc.
Many words ending in us that formerly were written with only the Latin
plural, are now given an English plural also; as, focuses, foci;
cactuses, cacti; sarcophaguses, sarcophagi; convolvuluses, convolvuli
; funguses, fungi; nucleuses, nuclei.
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Isthmus, prospectus, rebus, take only the English plural.
Apparatus has no plural. Avoid apparatuses.
The plural of genius, as applied to a man of unusual vigor of mind, is
geniuses. When applied to a good or bad spirit, the plural is genii.
Formula
Formulas, larvas, stigmas, are regular English plurals; formulae,
larvae, and stigmata are the classical plurals. Nebulae and alumnae
are the proper plurals, the latter being the feminine noun
corresponding to the masculine plural alumni.
Datum, Phenomenon
Datum, erratum, candelabrum, and memorandum form their plurals by
changing um to a; as, data, errata, etc.
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