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Medical Definition of Malarial pigment
1. A dark brown, granular pigment which rotates the plane of polarised light and has other properties similar to formalin pigment; occurs in parasites, such as Plasmodium malariae, around brain capillaries, and in fixed macrophages of spleen, liver, bone marrow, and lymph nodes. See: malarial pigment stain. (05 Mar 2000)