ETYM Old Eng. balled, ballid, perh. the p. p. of ball to reduce to the roundness or smoothness of a ball, by removing hair. But cf. W. bali whiteness in a horse's forehead.
(Homonym: balled).
1. Lacking hair on all or most of the scalp; SYN. bald-headed, bald-pated.
2. With no effort to conceal; SYN. barefaced.
3. Without the natural or usual covering; SYN. bare, denuded, denudate.

To grow bald; lose hair on one's head.