Synonyms for Sheep-tick (same or very similar meaning)
WordNet sense 1 (wingless fly that is an external parasite on sheep and cattle):
sheep ked, Melophagus Ovinus, sheep tickWordNet sense 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):
Ixodes ricinusFrom the ODE community, based on WordNetadd/edit