Mi"cro*pyle (?), n. [Micro- + Gr. 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.
An opening in the outer coat of a seed, through which the fecundating pollen enters the ovule.
© Webster 1913.