2. Full, strong muscles, especially. Of the arm or leg, muscular strength; a protuberant muscular part of the body; sometimes, the arm. Brawn without brains is thine. (Dryden) It was ordained that murderers should be brent on the brawn of the left hand. (E. Hall) And in my vantbrace put this withered brawn. (Shak)
4. A boar.
Origin: OF. Braon fleshy part, muscle, fr. Hg. Brto flesh, g. Braten roast meat; akin to Icel. Br flesh, food of beasts, as. Brde roast meat, brdan to roast, g. Braten, and possibly to E. Breed. Muscular strength.