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extine

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Extine
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ex⋅tine

  [ek-steen, -stahyn]
–noun Botany.
exine.
Use extine in a Sentence
Origin:
1825–35; < L ext(imus) most outward + -ine 1
Extine
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ex⋅ine

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

Origin:
1880–85; ex- 1 + -ine 1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2010.
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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.
extine   (ěk'stēn', -stīn')  Pronunciation Key 
See exine.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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