Micropyl

n. [ Micro- + Gr. &unr_; gate, orifice: cf. F. micropyle. ] (Biol.) (a) An opening in the membranes surrounding the ovum, by which nutrition is assisted and the entrance of the spermatozoa permitted. (b) An opening in the outer coat of a seed, through which the fecundating pollen enters the ovule. -- Mi*crop"y*lar a. [1913 Webster]