Orthotropal \Or*thot"ro*pal\, Orthotropous \Or*thot"ro*pous\, a.
[Ortho- + Gr. ? to turn: cf. F. orthotrope.] (Bot.)
Having the axis of an ovule or seed straight from the hilum
and chalaza to the orifice or the micropyle; atropous.
[1913 Webster]
Note: This word has also been used (but improperly) to
describe any embryo whose radicle points towards, or is
next to, the hilum.
[1913 Webster]