dĭaetētĭcus — Lewis & Short
dĭaetētĭcus, a, um, adj., = diaithtiko/s,
I belonging to diet:
libri, curatio,Cael. Aur. Tard. 2, 12, 145.—Subst., diaetetici, ōrum, m., physicians who cure by diet (opp. chirurgi), Scrib. Comp. 200 (cf. Cic. Att. 4, 3, 3).