Note 222 — Aphrodisiacs and Anti-Aphrodisiacs: (continued 3)
Reading edition
"Castrum quasi Castum, Castra," says Isidorus in his Etymologies, Lib. IX., "sunt ubi miles steterit: dicta autem, castra, quasi casta, eò quod ibi castraretur libido." A castle from castrating of lust.