The double plurals, cherubims and seraphims, although found
in the King James version of the Bible, are regarded as faulty in
modern writing, and should be avoided.
News
Although plural in form, the word news is singular in meaning; as,
"The news from Europe this morning is quite interesting."
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Acoustics
Names of sciences ending in ics, are generally regarded as singular.
"Acoustics is a very considerable branch of physics." Do not say, "The
acoustics of this hall are good," but "The acoustic properties of this
hall are good."
Dialectics, dynamics, economics, mathematics, ethics, politics,
tactics, when used as substantives, require a verb in the singular.
Analysis
Many words like analysis, crisis, ellipsis, emphasis, hypothesis,
oasis, parenthesis, synopsis, form their plurals by changing the
termination is into es; as, analyses, crises, etc. The word iris takes
the English plural irises; Latin plural is irides. Chrysalis has only
the Latin plural, chrysalides; but chrysalid, which means the same as
chrysalis, takes the English plural, chrysalids.
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