Blow"er (&?;), n. 1. One who, or that which, blows.

2. (Mech.) A device for producing a current of air; as: (a) A metal plate temporarily placed before the upper part of a grate or open fire. (b) A machine for producing an artificial blast or current of air by pressure, as for increasing the draft of a furnace, ventilating a building or shaft, cleansing gram, etc.

3. A blowing out or excessive discharge of gas from a hole or fissure in a mine.

4. The whale; -- so called by seamen, from the circumstance of its spouting up a column of water.

5. (Zoöl.) A small fish of the Atlantic coast (Tetrodon turgidus); the puffer.

6. A braggart, or loud talker. [Slang] Bartlett.

• Person who blows.
  
• Any device that blows.
  
• (the blower) (slang, dated; chiefly British) telephone.
       Get on the blower and call headquarters right away!
  
• A ducted fan, usually part of some heating, ventilation, and/or air conditioning system.