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Medical Definition of Besnoitia
1. A genus of protozoan parasites (family Besnoitiidae, class Sporozoea), closely related to Toxoplasma, that localise in subcutaneous, connective, serous, and other tissues and are surrounded by a heavy, nucleated wall of host tissue, forming a cyst; hosts include domestic ruminants, reindeer, caribou, rodents, opossums, and reptiles. (05 Mar 2000)