pneumatophore

Etymology

pneumato- + -phore

noun

  1. (zoology) A gas-filled sac or float of some colonial marine coelenterates, such as the Portuguese man-of-war.
  2. (botany) An aerial root, in mangroves etc., specialized for gaseous exchange.
  3. An apparatus consisting of a bag with a tube and mouthpiece, which may be attached to the body. The bag contains oxygen to be breathed by the wearer in rescue work in mines, etc.

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