Definitions for: Sis

[n] a female person who has the same parents as another person; "my sister married a musician"

Webster (1913) Definition: Sis, n.
A colloquial abbreviation of Sister.

Sis, n.
Six. See Sise. [Obs.] --Chaucer.

Synonyms: sister

Antonyms: blood brother, brother

See Also: big sister, female sibling, half sister, little sister, stepsister

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