Lewis & Short

physĭognōmon, ŏnis, m., = φυσιογνώμων (a knower of nature; hence, one who knows a person’s character from his features), a physiognomist: Zopyrus physiognomon, qui se profitebatur hominum mores naturasque ex corpore, oculis, vultu, fronte pernoscere, Cic. Fat. 5, 10; cf.: naturam cujusque ex formā perspicere, id. Tusc. 4, 37, 80.