From Middle English kne, from Old English cnēow, from Proto-West Germanic *kneu, from Proto-Germanic *knewą (compare Low German Knee, Dutch knie, German Knie, Danish knæ, Norwegian kne, Swedish knä), from Proto-Indo-European, a thematic derivative of *ǵónu. Cognate with Hittite 𒄀𒉡, Latin genū, Tocharian A kanweṃ, Tocharian B keni, Ancient Greek γόνυ, γωνία, Old Armenian ծունր, Avestan 𐬲𐬥𐬎𐬨, Sanskrit जानु.
The obsolete plural kneen is from Middle English kneen, knen, kneon, kneuwene.
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