gris·e·o·ful·vin 
(grĭzē-ə-fŭl′vĭn)
(grĭzē-ə-fŭl′vĭn)n.
An antibiotic, C17H17ClO6, administered orally for the treatment of ringworm and other fungal infections of the skin, hair, and nails.
[New Latin (Pēnīcillium) grīseofulvum, species of penicillium (Medieval Latin grīseus, griseous; see GRISEOUS + Latin fulvum, neuter of fulvus, tawny; see ghel-2 in the Appendix of Indo-European roots) + -IN.]