exine

[ ek-seen, -sahyn ]
/ ˈɛk sin, -saɪn /

noun Botany.

the outer coat of a spore, especially a pollen grain.

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Also extine.

Origin of exine

First recorded in 1880–85; ex-1 + -ine1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for exine

exine

extine (ˈɛkstɪn, -tiːn, -taɪn)

/ (ˈɛksɪn, -aɪn) /

noun

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

Scientific definitions for exine

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