The Collaborative International Dictionary of English v.0.48:
Cozy \Co"zy\, n. [See Cozy,a.] A wadded covering, often decorative, for a teakettle or other vessel to keep the contents hot. Also called tea cozy [1913 Webster +PJC]WordNet (r) 3.0 (2006):
tea cozy n 1: a padded cloth covering to keep a teapot warm [syn: cosy, tea cosy, cozy, tea cozy]