The Collaborative International Dictionary
Orthotropous
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.
Note: This word has also been used (but improperly) to describe any embryo whose radicle points towards, or is next to, the hilum.
Wiktionary
orthotropous
a. (context botany of an ovule English) Growing straight and having the micropyle at the apex
WordNet
orthotropous
adj. (of a plant ovule) completely straight with the micropyle at the apex [ant: campylotropous]