Source : Webster's Revised Unabridged Dictionary (1913)

Homotropal \Ho*mot"ro*pal\, Homotropous \Ho*mot"ro*pous\, a.
   [Gr. ?; ? the same + ? turn, fr. ? to turn: cf. F.
   homotrope.]
   1. Turned in the same direction with something else.

   2. (Bot.) Having the radicle of the seed directed towards the
      hilum.