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1. Botany A minute opening in the ovule of a seed plant through which the pollen tube usually enters.
2. Zoology A pore in the membrane covering the ovum of some animals through which a spermatozoon can enter.

[micro- + Greek pulē, gate.]

mi′cro·py′lar adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.micropylar - of or relating to a micropylemicropylar - of or relating to a micropyle  
References in periodicals archive ?
Peroxidase activity develops in micropylar endosperm of tomato seeds prior to radical protrusion.
cycadifolius entered the cones, and the dye (and hence the pollen) was subsequently detected on the micropylar ends of the ovules.
2013) Sperm attractant in the micropylar region of fish and insect eggs.
Three cells (or nuclei) were grouped together at the micropylar end and constituted the egg apparatus (Fig.
According to earlier reports, hyphal entry occurs either from general seed surface, through embryonic rhizoids or from micropylar end (5,8,10,34,36,37,44,45).
In first type the eggs were arranged radially so that their micropylar ends were visible all-round the pod, while in the second type eggs were oriented in approximately the same way with their micropylar ends visible at only one side of the pod which is its ventral side.
The occurrence of a micropylar exudate in Musa and Ensete (Musaceae).
The number of micropylar openings and micropylar cells in the egg varied.