Sis Definition

sĭs
noun
Webster's New World

(informal) Shortened form of sister.

Wiktionary
Synonyms:
sister
Antonyms:
brother
abbreviation
(UK) Secret Intelligence Service.
Wiktionary
suffix
Forming nouns of action or process.
(medicine) Form noun of condition.
Wiktionary
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Other Word Forms of Sis

Noun

Singular:
sis
Plural:
sises

Origin of Sis

  • Ultimately from Ancient Greek -σις (-sis, “forms noun of action”), often via Latin or French.

    From Wiktionary

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