[ek-seen, -sahyn]
Also extine.

Origin of exine

First recorded in 1880–85; ex-1 + -ine1
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British Dictionary definitions for exine


extine (ˈɛkstɪn, -tiːn, -taɪn)

  1. botany the outermost coat of a pollen grain or a sporeCompare intine
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

exine in Science


[ĕksēn′, -sīn′]
  1. 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.