Etymology
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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.

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Definitions of chemical
1
chemical (adj.)
relating to or used in chemistry;
chemical engineer
chemical balance
Synonyms: chemic
chemical (adj.)
of or made from or using substances produced by or used in reactions involving atomic or molecular changes;
chemical fertilizer
2
chemical (n.)
material produced by or used in a reaction involving changes in atoms or molecules;
Synonyms: chemical substance
From wordnet.princeton.edu