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exine

[ek-seen, -sahyn] /ˈɛk sin, -saɪn/
noun, Botany
1.
the outer coat of a spore, especially a pollen grain.
Also, extine.
Origin
1880-1885
1880-85; ex-1 + -ine1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for exine

exine

/ˈɛksɪn, -aɪn/
noun
1.
(botany) the outermost coat of a pollen grain or a spore Compare intine
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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exine in Science
exine
  (ěk'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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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