exine

exine

[ek-seen, -sahyn]
noun Botany.
the outer coat of a spore, especially a pollen grain.
Also, extine.


Origin:
1880–85; ex-1 + -ine1

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World English Dictionary
exine or extine (ˈɛksɪn, -aɪn, ˈɛkstɪn, -tiːn, -taɪn)
 
n
botany Compare intine the outermost coat of a pollen grain or a spore
 
extine or extine
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
exine   (ěk'sēn', -sīn')  Pronunciation Key 
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.
The American Heritage® Science Dictionary
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