From Middle English whelmen, perhaps from Old English *hwealmnian, a variant of *hwealfnian, from hwealf, from Proto-West Germanic *hwalb, from Proto-Germanic *hwalbą, from Proto-Indo-European *kʷelp-. The English word is cognate with German Walm, Icelandic hvolf, Dutch welven, German wölben, Icelandic hvelfa, Old Saxon bihwelvian, Ancient Greek κόλπος.
The noun is derived from the verb.
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