chemical (adj.)

1570s, "relating to chemistry, pertaining to the phenomena with which chemistry deals," from chemic "of alchemy" (a worn-down derivative of Medieval Latin alchimicus; see alchemy) + -al (1). In early use also of alchemy. Related: Chemically. Chemical warfare is attested from 1917.

chemical (n.)

"a substance produced by a chemical process, a chemical agent," 1747, from chemical (adj.). Related: Chemicals.