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exine
[ ek-seen, -sahyn ]
noun
, Botany.
- the outer coat of a spore, especially a pollen grain.
exine
/ ĕk′sēn′,-sīn′ /
- 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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