C / campĭ-doctor
noun

campĭ-doctor

gen. campĭ-doctōris · gender masculine · decl. 3rd
(better as two words), , id.
one who drills; exercises soldiers in the; a drill-master
one who drills or exercises soldiers in the Campus Martius, a drill-master, Veg. Mil. 3, 6; 3, 8; 1, 13; Lampr. Alex. Sev. 53; Amm. 15, 3, 10; Inscr. Orell. 1790; 3495.