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.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.