Chambers's Twentieth Century Dictionary…
“ Catechu, kat′e-shoo, n. a substance used in tanning and dyeing, and medicinally as an astringent, obtained from the heart-wood of several East Indian trees, as the betel-nut, &c. [Tamil.] Catechumen, kat-e-kū′men, n. one who is being taught the rudiments of Christianity: the appellation given in the early Christian Church to those converted Jews and heathens who had not yet received baptism, but were undergoing a course of training and instruction preparatory to it.—adj. ”
