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extrorse dehiscence (black) of anthers


adj. Botany
Facing outward; turned away from the axis: extrorse anthers.

[Late Latin extrōrsus, turned outward (modeled on Latin intrōrsum, turned inward) : Latin extrā, outside; see extra- + Latin versus, past participle of vertere, to turn; see wer- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(ɛkˈstrɔːs) or


(Biology) botany turned or opening outwards or away from the axis: extrorse anthers.
[C19: from Late Latin extrorsus in an outward direction, from Latin extra- + versus turned towards]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ɛkˈstrɔrs, ˈɛk strɔrs)

adj. Bot.
turned or facing outward, as anthers that open toward the perianth.
[1855–60; < Late Latin extrorsus outward = Latin extr(a)- extra- + (v)orsus turned]
ex•trorse′ly, adv.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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The position with Ceratophyllum is supported by a shift from latrorse to introrse or extrorse anthers (in both taxa, the thecae are shifted toward one surface, but whether this is abaxial or adaxial is unknown).