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exine
[ek-seen, -sahyn]
noun
Botany.
the outer coat of a spore, especially a pollen grain.
exine
/ ˈɛkstɪn, -tiːn, -taɪn, ˈɛksɪn, -aɪn /
noun
botany the outermost coat of a pollen grain or a spore Compare intine
exine
The outer layer of the wall of a pollen grain. The exine is composed of the most durable organic polymer known, sporopollenin.
Also called extine
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Example Sentences
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Microspore spherical or oval, with or without a bladder-like extension of the exine, containing a prothallus of two or more cells, one of which produces two non-motile or motile male cells.
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The exine is a firm membrane, which defines the figure of the pollen-grain, and gives colour to it.
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