Meaning of breather

breath•er

Pronunciation: (brē'ur), [key]
— n.
  1. a pause, as for breath.
  2. vigorous exercise that causes heavy breathing.
  3. a person who breathes.
  4. a vent in a container or covering, as in a casing for machinery or in a storage tank, to equalize interior and exterior pressure, permit entry of air, escape of fumes, or the like.
  5. a device for providing air from the atmosphere to submerged or otherwise sealed-off persons, internal-combustion engines, etc.: the snorkel breather of a submarine.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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