[ noo-mat-uh-fawr, -fohr, nyoo-, noo-muh-tuh-, nyoo- ]
/ nʊˈmæt əˌfɔr, -ˌfoʊr, nyʊ-, ˈnu mə tə-, ˈnyu- /


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.

Origin of pneumatophore

First recorded in 1855–60; pneumato- + -phore

Related forms

pneu·ma·toph·or·ous [noo-muh-tof-er-uh s, nyoo-] /ˌnu məˈtɒf ər əs, ˌnyu-/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for pneumatophore

British Dictionary definitions for pneumatophore


/ (njuːˈmætəʊˌfɔː) /


a specialized root of certain swamp plants, such as the mangrove, that branches upwards, rising above ground, and undergoes gaseous exchange with the atmosphere
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

Science definitions for pneumatophore


[ nōō-mătə-fôr′, nōōmə-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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.