I was just looking at one of the "engines" episodes, 1772, about camera obscura.
Prof. Lienhard mentioned that "comrade" is derived from "camra" which had never
occurred to me.
comrade
n.
5Fr camarade < Sp camarada, chamber mate < L camera: see CAMERA6
1 a friend; close companion
2 a person who shares interests and activities in common with others; partner; associate: used as a form of address, as in a Communist party
3 [C3] [Colloq.] a Communist; esp., a fellow Communist
—SYN ASSOCIATE
com4rade[ly 73r!d lc8
adj.
com4rade[ship# 73r!d *ip#8
n.