dēmonstrātor — Lewis & Short
dēmonstrātor, ōris, m.id.,
I 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.