The Collaborative International Dictionary of English v.0.48:
Oolong \Oo"long\, n. [Chinese, green dragon.] A fragrant variety of black tea having somewhat the flavor of green tea. [Written also oulong.] [1913 Webster] OomiacWordNet (r) 3.0 (2006):
oolong n 1: Chinese tea leaves that have been partially fermented before being dried