The Collaborative International Dictionary of English v.0.48:

Skillet \Skil"let\, n. [OF. escuelette, dim. of escuelle a
   porringer, F. ecuelle, fr. L. scutella, dim. of scutra,
   scuta, a dish. Cf. Scuttle a basket.]
   A small vessel of iron, copper, or other metal, with a
   handle, used for culinary purpose, as for stewing meat.
   [1913 Webster]

WordNet (r) 3.0 (2006):

skillet
    n 1: a pan used for frying foods [syn: frying pan, frypan,
         skillet]