-s'

suffix denoting the possessive case of plural nouns and sometimes of singular nouns ending in s (the boys' shoes; Charles' book).
Etymology: as -'S(1)

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\like -s I\ noun plural suffix

Etymology: Middle English -s, alteration of -es — more at -es'

— used to form the plural possessive of most nouns that do not end in s, z, sh, ch, or postconsonantal y

girls'

workers'

voters'

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-s' [-s'] suffix

(forming the end of plural nouns) belonging to

•

the cats' tails

•

their wives' jobs