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WordNet
sheep-tick
  1. n. wingless fly that is an external parasite on sheep and cattle [syn: sheep ked, 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, Ixodes ricinus]