[noo-mat-uh-fawr, -fohr, nyoo-, noo-muh-tuh-, nyoo-]
Botany. a specialized structure developed from the root in certain plants growing in swamps and marshes, serving as a respiratory organ.
Zoology. the air sac of a siphonophore, serving as a float.

1855–60; pneumato- + -phore

pneumatophorous [noo-muh-tof-er-uhs, nyoo-] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pneumatophore (njuːˈmætəʊˌfɔː)
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 10th Edition
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American Heritage
Science Dictionary
pneumatophore   (n-māt'ə-fôr', n'mə-tə-)  Pronunciation Key 
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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Example sentences
The surface of the pneumatophore has minute pores through which gas exchange takes place.
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