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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 ?
According to Coflein, Garrett set up the Garrett Sub-Marine Navigation and Pneumatophore Company Ltd to build the experimental craft.
According to Coflien, Garrett set up the Garrett Sub-Marine Navigation and Pneumatophore Company Ltd to build the experimental craft.
Shoot density of Spartina was similar at the Chandeleur Islands and Horn Island, but pneumatophore density at the Chandeleurs was much higher (mean = 250/[m.
smallest fish) were within areas of moderate pneumatophore density (Fig.
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.
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.
The upper part of the colony consists of buoyant nectophores, underneath the pneumatophore responsible for the colony's vertical orientation and buoyancy.
The 3 ft (1 m) long phylloids (leaves) are distributed along the stipes and have an air bladder, or pneumatophore, that helps them to float.
Finally, the mangroves will dissipate the wave energy with their propped roots, pneumatophores and trunks before the waves reach the shore.
Sponges, bivalves and seaweeds attached to the boulders, jetties, rocks on the shores, stones, pebbles, fishing nets and pneumatophores of mangrove were collected by scrapping.