Peculium \Pe*cu"li*um\, n. [L. See {Peculiar}.] 1. (Rom. Law) The saving of a son or a slave with the father's or master's consent; a little property or stock of one's own; any exclusive personal or separate property. --Burrill. 2. A special fund for private and personal uses. A slight peculium only subtracted to supply his snuff box and tobacco pouch. --Sir W. Scott.