D defs.my
Entry 5 senses Webster, 1913

Breather

/brēth'-ẽr/ · Breath·er · IPA /ˈbɹiː.ðə(ɹ)/
01 n. One who breathes.
  1. 1.
    One who breathes.
  2. 2.
    That which puts one out of breath, as violent exercise.[Colloq.]
  3. 3.
    a pause to catch one's breath, or for some other form of rest or refreshment; -- often used in the phrase to take a breather, i.e. to pause for refreshment.[Colloq.]
  4. 4.
    a vent in a container to allow equalization of internal and external pressure.
  5. 5.
    an air intake pipe to provide air to machinery or people submerged or otherwise sealed off from the outside.