Etymology
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sister-in-law (n.)

mid-15c.; see sister + in-law.

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Definitions of sister-in-law

sister-in-law (n.)
the sister of your spouse;
From wordnet.princeton.edu

Dictionary entries near sister-in-law

sissify

sissy

sist

sister

sisterhood

sister-in-law

sisterly

Sistine

Sisyphean

Sisyphus

sit