griseofulvin
noun
gris·eo·ful·vin ˌgri-zē-ō-ˈfu̇l-vən 
ˌgri-sē-,
-ˈfəl- : an antibiotic C17H17ClO6 used systematically in treating superficial fungal infections
Example Sentences
Recent Examples on the Web Research has found that the antibiotic rifampin, which is used to treat tuberculosis, and griseofulvin, a drug used to treat fungal infections, may decrease the effectiveness of hormonal birth control pills. 
Korin Miller, SELF, 27 July 2017
Korin Miller, SELF, 27 July 2017 Word History
Etymology
New Latin griseofulvum, specific epithet of Penicillium griseofulvum, mold from which it is obtained
First Known Use
1939, in the meaning defined above
Medical Definition
griseofulvin
noun
gris·eo·ful·vin ˌgriz-ē-ō-ˈfu̇l-vən ˌgris-
ˌgris- -ˈfəl-
: a fungistatic antibiotic C17H17ClO6 used systemically in treating superficial infections by fungi especially of the genera Epidermophyton, Microsporum, and Trichophyton