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From The Collaborative International Dictionary of English v.0.48:
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]