noun

1. a small, usually hard, tumorous growth on the skin, caused by a virus
2. any small protuberance, as a glandular protuberance on a plant
3. an imperfection, failing, flaw, etc. a lovable person, warts and all

Etymology: ME warte < OE wearte, akin to Ger warze < IE base *wer-, a raised place > L verruca, wart, varix