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The Collaborative International Dictionary
Antitropal

Antitropal \An*tit"ro*pal\, Antitropous \An*tit"ro*pous\, a. [Pref. anti- + Gr. ? turn, ? to turn.] (Bot.) At the extremity most remote from the hilum, as the embryo, or inverted with respect to the seed, as the radicle.
--Lindley.

Wiktionary
antitropal

a. (context botany English) antitropous