what is anaplasma
Medical Definition of anaplasma. 1  1 capitalized : a genus of parasitic, gram-negative, nonmotile bacteria of the family Anaplasmataceae that are transmitted chiefly by ticks and biting flies and infect the red blood cells of humans and animalsâsee anaplasmosis. 2  2plural anaplasmas or anaplasmata \-mÉt-É\play : any bacterium of the genus Anaplasma.