WordNet (r) 3.0 (2006):
sheep-tick n 1: wingless fly that is an external parasite on sheep and cattle [syn: sheep ked, sheep-tick, sheep tick, Melophagus Ovinus] 2: parasitic on sheep and cattle as well as humans; can transmit looping ill in sheep (acute viral disease of the nervous system); a vector for Lyme disease spirochete [syn: sheep- tick, sheep tick, Ixodes ricinus]