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rachilla

[ruh-kil-uh] /rəˈkɪl ə/
noun, plural rachillae
[ruh-kil-ee] /rəˈkɪl i/ (Show IPA).
Botany
1.
a small or secondary rachis, as the axis of a spikelet in a grass inflorescence.
Origin
1835-1845
1835-45; < New Latin, diminutive of rachis rachis
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for rachillae

rachilla

/rəˈkɪlə/
noun
1.
(in grasses) the short stem of a spikelet that bears the florets
Word Origin
C19: from New Latin, diminutive of rachis
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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rachillae in Science
rachilla
  (rə-kĭl'ə)   
Plural rachillae (rə-kĭl'ē)
The stalk that bears the florets in the spikelets of grasses and similar plants, such as rushes and sedges. The rachilla often has a zigzag shape, with florets at each point at which the orientation of the rachilla turns.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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