The Collaborative International Dictionary of English v.0.48:

Wiry \Wir"y\, a. [Written also wiery.]
   [1913 Webster]
   1. Made of wire; like wire; drawn out like wire.
      [1913 Webster]

   2. Capable of endurance; tough; sinewy; as, a wiry frame or
      constitution. "A little wiry sergeant of meek demeanor and
      strong sense." --Dickens.
      [1913 Webster]

            He bore his age well, and seemed to retain a wiry
            vigor and alertness.                  --Hawthorne.
      [1913 Webster]

WordNet (r) 3.0 (2006):

wiry
    adj 1: lean and sinewy [syn: stringy, wiry]
    2: of or relating to wire
    3: of hair that resembles wire in stiffness; "wiry red hair"

Moby Thesaurus II by Grady Ward, 1.0:

55 Moby Thesaurus words for "wiry":
   able-bodied, athletic, brawny, broad-shouldered, burly, capillary,
   cartilaginous, chewy, cirrose, cirrous, cohesive, coriaceous,
   durable, fibered, fibroid, fibrous, flagelliform, flossy,
   funicular, gossamery, gristly, hairlike, hairy, hard, hardy,
   lasting, leatherlike, leathery, ligamental, muscle-bound, muscular,
   resistant, ropy, silky, sinewy, stiff, stringy, strong, stubborn,
   taeniate, taeniform, tenacious, thewy, thickset, threadlike,
   thready, tough, tough as leather, untiring, vigorous, viscid,
   well-built, well-knit, well-set, well-set-up