The Collaborative International Dictionary of English v.0.48:

Buffa \Buf"fa\, n. fem. (Mus.) [It. See Buffoon.]
   The comic actress in an opera. -- a. Comic, farcical.
   [1913 Webster]

   Aria buffa, a droll or comic air.

   Opera buffa, a comic opera. See Opera bouffe.
      [1913 Webster]