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Medical Definition of Hyalomma
1. An Old World genus (about 21 species) of large ixodid ticks with submarginal eyes, coalesced festoons, an ornate scutum, and a long rostrum. Adults parasitise all domestic animals and a wide variety of wild animals; larvae or nymphs may parasitise small mammals, birds, and reptiles. Species harbor a great variety of pathogens of humans and animals, and also cause considerable mechanical injury. Origin: hyalo-+ G. Omma, eye (05 Mar 2000)