- Zoology. any minute opening in an ovum through which a spermatozoon can enter, as in many insects.
- Botany. the minute orifice or opening in the integuments of an ovule.
Origin of micropyle
1815–25; micro- + Greek pýlē gate
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for micropyle
The micropyle covers the upper surface of the egg and is not depressed.The Butterfly Book
William Jacob Holland
Micropyle, answering to the Foramen or orifice of the ovule.The Elements of Botany
Every ovule has a tiny opening, or micropyle as it is called, and it is now easy to guess what that is for.The Renewal of Life; How and When to Tell the Story to the Young
Margaret Warner Morley
At one end a cap-like portion of this forms a detachable operculum, in the middle of which is a minute opening, the micropyle.
In some cases it is advisable to slice off the end of the egg with the micropyle and mount it microscopically.Taxidermy and Zoological Collecting
William T. Hornaday
- a small opening in the integuments of a plant ovule through which the male gametes pass
- a small pore in the shell of an insect's eggs through which the sperm passes
C19: from micro- + Greek pulē gate
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
- A minute opening in the ovule of a seed plant through which the pollen tube usually enters.
- A pore in the membrane covering the ovum of some animals through which a spermatozoon can enter.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.