The Collaborative International Dictionary of English v.0.48:
Muffin \Muf"fin\, n. [From Muff.] A light, spongy, cylindrical cake, used for breakfast and tea. [1913 Webster]WordNet (r) 3.0 (2006):
muffin n 1: a sweet quick bread baked in a cup-shaped pan [syn: muffin, gem]