pneumatophore
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pneu·mat·o·phore
(no͞o-măt′ə-fôr′, nyo͞o-, no͞o′mə-tə-, nyo͞o′-)n.
1. A gas-filled sac serving as a float in some colonial marine hydrozoans, such as the Portuguese man-of-war.
2. Botany A specialized respiratory root in certain aquatic plants, such as the bald cypress, that grows upward and protrudes above the water or mud into the air.
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.
pneumatophore
(njuːˈmætəʊˌfɔː)n
1. (Botany) 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. (Zoology) 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 and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
pneu•mat•o•phore
(nʊˈmæt əˌfɔr, -ˌfoʊr, nyʊ-)n.
1. a specialized structure developed from the root in certain plants growing in swamps and marshes, serving as a respiratory organ.
2. the air sac of a siphonophore, serving as a float.
[1855–60]
pneu•ma•toph•or•ous (ˌnu məˈtɒf ər əs, ˌnyu-) adj.
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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| Noun | 1. | pneumatophore - an air-filled root (submerged or exposed) that can function as a respiratory organ of a marsh or swamp plant root - (botany) the usually underground organ that lacks buds or leaves or nodes; absorbs water and mineral salts; usually it anchors the plant to the ground |
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