/griz'ee oh fool"vin, -ful"-, gris'-/ , n. Pharm.
an antibiotic, C 17 H 17 ClO 6 , obtained from a species of Penicillium, used in the treatment of ringworm and other fungous infections of the skin.
[ 1935-40; griseofulv ( um ) epithet of a species of Penicillium (equiv. to ML grise ( us ) GRISEOUS + NL -o- -O- + L fulvum, neut. of fulvus tawny, yellow-brown) + -IN 2 ]