MICROPYLE
\mˈa͡ɪkɹə͡ʊpˌa͡ɪl], \mˈaɪkɹəʊpˌaɪl], \m_ˈaɪ_k_ɹ_əʊ_p_ˌaɪ_l]\
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By Oddity Software
By Noah Webster.
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The aperture for admission of pollen-tube at the ovule apex; the aperture in the egg-membrane for admission of spermatozoon; a pore in the sponging-coat of Sponges for escape of gemmules.
By Henderson, I. F.; Henderson, W. D.
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An opening in the episperm of seeds, through which the recundating pollen enters the ovule to fecundate it. It has been supposed, that such a micropyle exist in the human ovule.
By Robley Dunglison
By Willam Alexander Newman Dorland
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A minute opening in the vitelline membrane of the unimpregnated ovum, in certain of the lower animals, supposed by M. Barry, its discoverer, to serve for the passage of the spermatozoids into the vitellus in the act of fecundation, by others to assist the nutrition of the ovum during its development. [Lat., from Gr.]
By Smith Ely Jelliffe
Word of the day
Quinones
- Hydrocarbon rings which contain two moieties position. They can be substituted in any position except at the ketone groups.