Source : Webster's Revised Unabridged Dictionary (1913)

Anatropal \A*nat"ro*pal\, Anatropous \A*nat"ro*pous\, a. [Gr. ?
   up + ? to turn.] (Bot.)
   Having the ovule inverted at an early period in its
   development, so that the chalaza is as the apparent apex; --
   opposed to {orthotropous}. --Gray.