The Collaborative International Dictionary of English v.0.48:

Emaciate \E*ma"ci*ate\, v. i. [imp. & p. p. Emaciated; p. pr.
   & vb. n. Emaciating.] [L. emaciatus, p. p. of emaciare to
   make lean; e + maciare to make lean or meager, fr. macies
   leanness, akin to macer lean. See Meager.]
   To lose flesh gradually and become very lean; to waste away
   in flesh. "He emaciated and pined away." --Sir T. Browne.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

emaciated \emaciated\ adj.
   having become so thin that the bones noticeably protude under
   the skin; as, emaciated bony hands.

   Syn: bony, cadaverous, gaunt, haggard, pinched, skeletal,
        wasted.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

emaciated
    adj 1: very thin especially from disease or hunger or cold;
           "emaciated bony hands"; "a nightmare population of gaunt
           men and skeletal boys"; "eyes were haggard and
           cavernous"; "small pinched faces"; "kept life in his
           wasted frame only by grim concentration" [syn: bony,
           cadaverous, emaciated, gaunt, haggard, pinched,
           skeletal, wasted]

Moby Thesaurus II by Grady Ward, 1.0:

64 Moby Thesaurus words for "emaciated":
   Sanforized, anorectic, anorexic, atrophied, attenuated, bony,
   brittle, cadaverous, consumed, consumptive, corky, corpselike,
   desiccated, drawn, dried-up, emacerated, emaciate, gaunt, haggard,
   half-starved, hollow-eyed, jejune, lean, marantic, marasmic,
   papery, parched, parchmenty, peaked, peaky, phthisic, pinched,
   poor, preshrunk, puny, scrawny, sear, sere, shriveled,
   shriveled up, shrunk, shrunken, skeletal, skinny, spare, starved,
   starveling, tabetic, tabid, thin, underfed, undernourished, wasted,
   wasted away, wasting away, weazened, weazeny, wilted, withered,
   wizen, wizen-faced, wizened, wraithlike, wrinkled