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[ek-strawrs, ek-strawrs] /ɛkˈstrɔrs, ˈɛk strɔrs/
adjective, Botany
turned or facing outward, as anthers that open toward the perianth.
Origin of extrorse
1855-60; < Late Latin extrorsus in outward direction, equivalent to extr(a)- extra- + (v)orsus (adv.) turned
Related forms
extrorsely, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for extrorse


(botany) turned or opening outwards or away from the axis: extrorse anthers
Word Origin
C19: from Late Latin extrorsus in an outward direction, from Latin extra- + versus turned towards
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
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extrorse in Science
Facing outward, away from the central axis around which a flower is arranged. Used of anthers and the direction in which they open to release pollen.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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