D / dēmonstrātor
noun

dēmonstrātor

gen. dēmonstrātōris · gender masculine · decl. 3rd
one who points out; indicates; an indicator, exhibiter
one who points out or indicates; an indicator, exhibiter (very rare): uniuscujusque sepeliendi, * Cic. de Or. 2, 86, 353: hujus rationis, Col. 3, 10, 20: medicinarum Aesculapius, Tert. Apol. 23.