nī^grefacĭo

ēre, v. a.

1. niger-facio

I. to make black, to blacken: nigrefacio, μελανοποιῶ, Vet. Gloss.—Pass.: nigrĕfīo, to become black, Theod. Prisc. 1, 5.
Lewis & Short
A Latin Dictionary, 1879
An open-access project