The Collaborative International Dictionary
Homotropal
Homotropal \Ho*mot"ro*pal\, Homotropous \Ho*mot"ro*pous\, a. [Gr. ?; ? the same + ? turn, fr. ? to turn: cf. F. homotrope.]
Turned in the same direction with something else.
(Bot.) Having the radicle of the seed directed towards the hilum.
Wiktionary
homotropal
a. homotropous