1、A flagellate protozoan, such as a trypanosome, that is parasitic in the blood.
2、A single-celled microorganism, especially a flagellate protozoan of the genus Monas.
3、Any of various flagellate protozoans of the genus Trichomonas, occurring as parasites in the digestive and urogenital tracts of vertebrates.
4、An infection caused by any of the flagellate protozoans of the genus Leishmania, transmitted to human beings and animals by bloodsucking sand flies.
5、Any of various parasitic flagellate protozoans of the genus Trypanosoma, transmitted to the vertebrate bloodstream, lymph, and spinal fluid by certain insects and often causing diseases such as sleeping sickness and nagana.
