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1 An aerial negatively geotropic root that acts as an organ of gaseous exchange. Pneumatophores are produced by mangroves and other plants that grow in waterlogged oxygen-deficient soils. See mangrove swamp.

2 The gas-filled float of certain colonial cnidarians of the class Hydrozoa, such as Physalis (Portuguese man-of-war).

Subjects: Plant Sciences and Forestry — Ecology and Conservation.

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