The Collaborative International Dictionary of English v.0.48:
beanie \beanie\ n. a small skullcap; formerly worn by schoolboys and college freshmen. Syn: beany. [WordNet 1.5]WordNet (r) 3.0 (2006):
beanie n 1: a small skullcap; formerly worn by schoolboys and college freshmen [syn: beanie, beany]