What does antitropal or antitropous mean?
The definition of antitropal and antitropous
An*tit”ro*pal, An*tit”ro*pous, a.
Etym: [Pref. anti- + Gr. (Bot.)

At the extremity most remote from the hilum, as the embryo, or inverted with respect to the seed, as the radicle. Lindley.