CIDE DICTIONARY
brawn, n. [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.].
THESAURUS
brawn
all that lives, beef, beefiness, biosphere, biota, brawniness, ecosphere, elasticity, fiber, flesh, flora and fauna, heftiness, huskiness, involuntary muscle, living matter, living nature, might, muscle, muscles, muscularity, musculature, noosphere, organic matter, organic nature, organized matter, physique, plasm, power, robustness, sinew, sinewiness, sinews, strength, thew, thewiness, thews, tissue, tone, voluntary muscle