the world > matter > chemistry > chemical reactions or processes > [adjective] > of or relating to chemical processes (general) > left as a residuum after a (5)
Left as a sediment or residue.
Science. Of the nature of a residue; left over at the end of a process; = residual, adj. 3. Also figurative. Now rare.
Science. Formed or resulting as a by-product or residue; left over after a physical or biological process, a course of treatment, etc.