The Collaborative International Dictionary of English v.0.48:

Hypertrophic \Hy`per*troph"ic\, Hypertrophical
\Hy`per*troph"ic*al\, a. [Cf. F. hypertrophique.] (Med. & Biol.)
   Of or pertaining to hypertrophy; affected with, or tending
   to, hypertrophy.
   [1913 Webster]