The Collaborative International Dictionary
Pneumatophore
Pneumatophore \Pneu*mat"o*phore\, n. [Pneumato- + Gr. fe`rein to bear.] (Zo["o]l.) One of the Pneumonophora.
Wiktionary
pneumatophore
n. 1 (context zoology English) A gas-filled sac or float of some colonial marine coelenterates, such as the Portuguese man-of-war. 2 (context botany English) An aerial root, in mangroves etc., specialized for gaseous exchange.
WordNet
pneumatophore
n. an air-filled root (submerged or exposed) that can function as a respiratory organ of a marsh or swamp plant
Usage examples of "pneumatophore".
All airplants stayed aloft by means of thin-walled pneumatophores, float-chambers containing lighter-than-air gases.