Proto-Baltic: *kū̂š= (1?): *kū̂š-ā̂ (1), *kūš-ia-, -iā̃ (1) f., *kuš-k-ia-
Meaning: pubic hair, bunch
Lithuanian: kūšī̃-s `Haarbüschel über der weibl. Scham, weibl. Scham'; kùški-s `Flocke, (Haar)büschel, Wisch'
Lettish: kūse 'Schamhaare; weibliche Scham', kũsa `Schamhaare', kūsis `Schamhaare, weibl. Scham', kušk̨is `Büschel, Handvoll; Wisch, Strohwisch'
Proto-IE: *kūk's-
Meaning: vulva, cunnus
Old Indian: kukṣí- m. `belly, womb, cavity'
Other Iranian: ? NPers kus `weibliche Scham'
Russ. meaning: vulva, cunnus
References: WP II 546 f