fronto, ōnis, m. amplif. [2. frons],
one who has a broad forehead : ecquos naevum habere? ecquos silos, flaccos, frontones, capitones? Cic. N. D. 1, 29, 80.—Hence,
frontō ōnis, m 2 frons, one with a large forehead . ...
An Elementary Latin Dictionary