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Definition of Sis
1. Noun. A female person who has the same parents as another person. "My sister married a musician"
Exact synonyms: Sister
Specialized synonyms: Big Sister, Little Sister, Half Sister, Half-sister, Stepsister
Generic synonyms: Female Sibling
Antonyms: Brother
Derivative terms: Sisterhood, Sisterly
Specialized synonyms: Big Sister, Little Sister, Half Sister, Half-sister, Stepsister
Generic synonyms: Female Sibling
Antonyms: Brother
Derivative terms: Sisterhood, Sisterly
Definition of Sis
1. n. A colloquial abbreviation of Sister.
2. n. Six. See Sise.
Definition of Sis
1. sister [n SISES or SISSES]
Medical Definition of Sis
1.