Source : Webster's Revised Unabridged Dictionary (1913)

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.

Emaciate \E*ma"ci*ate\, v. t.
   To cause to waste away in flesh and become very lean; as, his
   sickness emaciated him.

Emaciate \E*ma"ci*ate\, a. [L. emaciatus, p. p.]
   Emaciated. ``Emaciate steeds.'' --T. Warton.

Source : WordNet®

emaciate
     v 1: cause to grow thin or weak; "The treatment emaciated him"
          [syn: {waste}, {macerate}]
     2: grow weak and thin or waste away physically; "She emaciated
        during the chemotherapy"