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Definition of: micropyle
(mī′krə·pīl) noun
1. Bot. The aperture in the coats of a plant ovule through which the pollen tube penetrates.
2. Biol. An aperture in the vitelline membrane of the ovum, serving to admit a spermatozoon. [<MICRO- + Gk. pylē gate]
—mi′cro.py′lar adjective
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