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pneumatophore

[noo-mat-uh-fawr, -fohr, nyoo-, noo-muh-tuh-, nyoo-] /nʊˈmæt əˌfɔr, -ˌfoʊr, nyʊ-, ˈnu mə tə-, ˈnyu-/
noun
1.
Botany. a specialized structure developed from the root in certain plants growing in swamps and marshes, serving as a respiratory organ.
2.
Zoology. the air sac of a siphonophore, serving as a float.
Origin
1855-1860
1855-60; pneumato- + -phore
Related forms
pneumatophorous
[noo-muh-tof-er-uh s, nyoo-] /ˌnu məˈtɒf ər əs, ˌnyu-/ (Show IPA),
adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for pneumatophores

pneumatophore

/njuːˈmætəʊˌfɔː/
noun
1.
a specialized root of certain swamp plants, such as the mangrove, that branches upwards, rising above ground, and undergoes gaseous exchange with the atmosphere
2.
a polyp in coelenterates of the order Siphonophora, such as the Portuguese man-of-war, that is specialized as a float
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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pneumatophores in Science
pneumatophore
  (n-māt'ə-fôr', n'mə-tə-)   
A specialized root that grows upwards out of the water or mud to reach the air and obtain oxygen for the root systems of trees that live in swampy or tidal habitats. The "knees" of mangroves and the bald cypress are pneumatophores. Also called air root.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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