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.

1815–25; micro- + Greek pýlē gate

micropylar, adjective
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World English Dictionary
micropyle (ˈmaɪkrəʊˌpaɪl)
1.  a small opening in the integuments of a plant ovule through which the male gametes pass
2.  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 10th Edition
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American Heritage
Science Dictionary
micropyle   (mī'krə-pīl')  Pronunciation Key 
  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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Example sentences
Micropyle, polar granule and oocyst residuum are absent.
Fertilization occurs through a small opening, the micropyle, usually shortly after the eggs are deposited.
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