beau Meaning, Definition & Usage

  1. noun a man who is the lover of a girl or young woman
    swain; fellow; young man; boyfriend.
    • if I'd known he was her boyfriend I wouldn't have asked
  2. noun a man who is much concerned with his dress and appearance
    gallant; dandy; clotheshorse; fop; swell; dude; sheik; fashion plate.

WordNet

Beau noun
Etymology
F., a fop, fr. beau fine, beautiful, fr. L. bellus pretty, fine, for bonulus, dim. of bonus good. See Bounty, and cf. Belle, Beauty.
Wordforms
plural feminine Beaux (E pronoun bz), E Beaus
Definitions
  1. A man who takes great care to dress in the latest fashion; a dandy.
  2. A man who escorts, or pays attentions to, a lady; an escort; a lover.

Webster 1913