cleft (n.) Look up cleft at Dictionary.com
1570s, alteration (by influence of cleft, new weak past participle of cleave (v.1)), of Middle English clift (early 14c.), from Old English geclyft (adj.) "split, cloven," from Proto-Germanic *kluftis (cognates: Old High German and German kluft, Danish kløft "cleft"), from PIE *gleubh- (see glyph). In Middle English anatomy, it meant "the parting of the thighs" (early 14c.).
cleft (adj.) Look up cleft at Dictionary.com
late 14c., past participle adjective from cleave (v.1)). Cleft palate attested from 1828.