histoplasmin
/ˌhɪstə(ʊ)ˈplazmɪn/Medicine
noun
A preparation of antigen from the fungus Histoplasma capsulatum, used in skin testing for histoplasmosis which results from exposure to the fungus.
Origin
1940s; earliest use found in Agatha Christie (1890–1976), writer. From scientific Latin Histoplasma + -in.