quaint:

Or, more rarely, quainter , obsolete term used by Geoffrey Chaucer (ca. 1343-1400) and his contemporaries for the vagina , an obvious pun on cunt . It has been suggested that cunt may derive from the Old English coint / coynte / quaint / qwaynt / queynte . See vagina for synonyms.

QUOTE: Geoffrey Chaucer. The Miller's Tale (1386): ' Full prively he caught her by the queinte .' and ' Prycelyhe caught her by the queynte .' ( Queynte , from quaint , a many-layered, in-folded mystery.)