The Collaborative International Dictionary of English v.0.48:

Steak \Steak\ (st[=a]k), n. [OE. steike, Icel. steik, akin to
   Icel. steikja to roast, stikna to be roasted or scorched, and
   E. stick, the steak being broiled on a spit. See Stick, v.
   t.]
   A slice of beef, broiled, or cut for broiling; -- also
   extended to the meat of other large animals; as, venison
   steak; bear steak; pork steak; turtle steak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

steak
    n 1: a slice of meat cut from the fleshy part of an animal or
         large fish

Moby Thesaurus II by Grady Ward, 1.0:

23 Moby Thesaurus words for "steak":
   London broil, Salisbury steak, T-bone steak, beefsteak, bifteck,
   chopped steak, club steak, cubed steak, fillet steak, flank steak,
   ground beef, ground chuck, ground round, hamburg, hamburg steak,
   hamburger, porterhouse steak, rib steak, round steak, rump steak,
   shell steak, sirloin steak, tenderloin steak