Proto-IE: *wamp-
Meaning: membrane (of bowels), intestines, womb
Old Indian: vapā́ f. `the skin or membrane investing the intestines or parts of the viscera, the caul or omentum'
Celtic: OCymr gumbelauc `Gebärmutter', Bret gwamm `Weib'
Russ. meaning: оболочка кишок, кишки
References: WP II 190 f