What do a.m. and p.m. stand for?


[mahy-kruh-pahyl] /ˈmaɪ krəˌpaɪl/
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
Related forms
micropylar, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for micropyle
  • micropyle, polar granule and oocyst residuum are absent.
  • Fertilization occurs through a small opening, the micropyle, usually shortly after the eggs are deposited.
British Dictionary definitions for micropyle


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
Derived Forms
micropylar, adjective
Word Origin
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
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micropyle in Science
  1. A minute opening in the ovule of a seed plant through which the pollen tube usually enters.

  2. A pore in the membrane covering the ovum of some animals through which a spermatozoon can enter.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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