The Collaborative International Dictionary of English v.0.48:

Dripping \Drip"ping\, n.
   1. A falling in drops, or the sound so made.
      [1913 Webster]

   2. That which falls in drops, as fat from meat in roasting.
      [1913 Webster]

   Dripping pan, a pan for receiving the fat which drips from
      meat in roasting.
      [1913 Webster]

WordNet (r) 3.0 (2006):

dripping pan
    n 1: pan for catching drippings under roasting meat [syn:
         dripping pan, drip pan]