Flat, smooth surface produced by cleavage, or any similar surface produced by similar techniques, as in glass.
From Middle English cleven, from the Old English strong verb clēofan, from Proto-Germanic *kleubaną, from Proto-Indo-European *glewbʰ-. clive. Cognate with Dutch klieven, dialectal German klieben, Swedish klyva, Norwegian Nynorsk kløyva; also Ancient Greek γλύφω ("carve").
From Middle English cleven, a conflation of two verbs: Old English clifian (from Proto-Germanic *klibāną) and Old English clīfan (from Proto-Germanic *klībaną), both ultimately from Proto-Indo-European *gleybʰ- ("to stick").
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