Pronunciation: (mī'kru-pīl"), [key]
1. Zool.any minute opening in an ovum through which a spermatozoon can enter, as in many insects.
2. Bot.the minute orifice or opening in the integuments of an ovule. See diag. under orthotropous.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.