Definition of -s' in English:

-s'

Pronunciation: /s, z after a vowel sound or voiced consonant/

suffix

Denoting possession in plural nouns and sometimes in singular nouns having a final s: the girls' dormitories Giles' sister

Origin

Old English -es.

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Word of the day humoresque
Pronunciation: ˌhjuːməˈrɛsk
noun
a short, lively piece of music