(medicine) Any of various ulcerative skin diseases caused by any of the protozoans of the genus Leishmania, transmitted to humans and animals by bloodsucking sandflies.

(medicine) The most common form of leishmaniasis, a disease caused by protozoan parasites of the genus Leishmania, which presents with open, ulcerative skin lesions.

(medicine) The most severe form of leishmaniasis, a disease caused by protozoan parasites of the genus Leishmania, in which the parasite migrates to the internal organs such as the liver, spleen, and bone marrow, often resulting in the death of the host.