The Collaborative International Dictionary of English v.0.48:

Stew \Stew\, v. t. [imp. & p. p. Stewed; p. pr. & vb. n.
   Stewing.] [OE. stuven, OF. estuver, F. ['e]tuver, fr. OF.
   estuve, F. ['e]tuve, a sweating house, a room heated for a
   bath; probably of Teutonic origin, and akin to E. stove. See
   Stove, and cf. Stive to stew.]
   To boil slowly, or with the simmering or moderate heat; to
   seethe; to cook in a little liquid, over a gentle fire,
   without boiling; as, to stew meat; to stew oysters; to stew
   apples.
   [1913 Webster]

WordNet (r) 3.0 (2006):

stewed
    adj 1: cooked in hot water [syn: boiled, poached, stewed]

Moby Thesaurus II by Grady Ward, 1.0:

68 Moby Thesaurus words for "stewed":
   afflicted, baked, bent, boiled, bombed, boozy, braised, broiled,
   browned, canned, cockeyed, cockeyed drunk, coddled, cooked,
   crocked, crocko, curried, deviled, drunken, elevated, fired,
   fricasseed, fried, fuddled, grilled, half-seas over, heated, high,
   illuminated, inebriated, lit, lit up, loaded, lubricated, lushy,
   muzzy, oiled, organized, oven-baked, pan-broiled, parboiled,
   pickled, pie-eyed, pissed, pissy-eyed, plastered, poached,
   polluted, potted, raddled, roast, roasted, sauteed, scalloped,
   seared, shellacked, shirred, skunk-drunk, smashed, soaked, soused,
   squiffy, steamed, stinko, swacked, tanked, tight, toasted