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 (no͞o-măt′ə-fôr′, nyo͞o-, no͞o′mə-tə-, nyo͞o′-)
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.


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


(nʊˈmæt əˌfɔr, -ˌfoʊr, nyʊ-)

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.
pneu•ma•toph•or•ous (ˌnu məˈtɒf ər əs, ˌnyu-) adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.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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References in periodicals archive ?
In the mangrove forest, we manipulated substrate using pneumatophore mimics constructed of 200-ram lengths of 7-mm-diameter maple wood dowel, inserted 100 mm into the sediment.
With the pneumatophore, which is the gas-bladder, floating at the surface and tentacles several metres long and very thin - but difficult to see - swimmers can see a Man-O-War a few metres away.
Eutrophication has adversely affecting mangrove growth through retardation of pneumatophore growth and retraction from highly reduced areas, and is exacerbated by regional subsidence raising the average tidal water level (Thomas et al.
Pneumatophores are like snorkels, helping the mangroves to breathe in air.
Black mangroves (Avicennia germinans) typically grow a few feet farther from the water's edge, surrounded by hundreds of cigar-like "breathing tubes" called pneumatophores.
The mangrove may be directly exposed or poisoned via adsorption of the toxic soluble fractions of PAHs through the pneumatophores and prop roots.
The most amazing are pneumatophores, or breathing roots, reason enough to visit.
Buttresses or stilt roots are absent in the tree; pneumatophores can be 50-90 cm high and 7 cm in diameter.
and be tripped by the pneumatophores (erect roots), an adaptation to the tidal nature of this forest type.
238) In India, the pneumatophores of grey mangroves
distinct; secondary roots branched; pneumatophores scattered;