D defs.my
Entry 3 senses Webster, 1913

Rouser

/rouz'-ẽr/ · Rous·er · IPA /rˈaʊzər/
01 n. One who, or that which, rouses.
  1. 1.
    One who, or that which, rouses.
  2. 2.
    Something very exciting or great.[Colloq.]
  3. 3.
    A stirrer in a copper for boiling wort.(Brewing)