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Definition of: pneumatophore
(n
′mə·tə·fôr′, -fōr′, ny′-) noun
1. Zool. The air-containing sac of a siphonophore.
2. Bot. A root structure found on certain tropical swamp trees: it contains lenticels and is supposed to act as a respiratory organ.
—pneu′ma·toph′o·rous (-tof′ər·əs) adjective
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