chemical

adj. pertaining to chemistry, used in a chemical process, produced by a chemical process

n. chemical substance; product manufactured by means of chemicals

A chemical substance is a material with a definite chemical composition. It is a concept that became firmly established in the late eighteenth century after work by the chemist Joseph Proust on the composition of some pure chemical compounds such as basic copper carbonate. He deduced that: "All samples of a compound have the same composition; that is, all samples have the same proportions, by mass, of the elements present in the compound". This became known as the law of constant composition. Later with the advancement of methods for chemical synthesis particularly in the realm of organic chemistry; the discovery of many more chemical elements and new techniques in the realm of  analytical chemistry used for isolation and purification of elements and compounds from chemicals that led to the establishment of modern chemistry, the concept was defined as is found in most chemistry textbooks. However, there are some controversies regarding this definition mainly because the large number of chemical substances reported in chemistry literature need to be indexed.
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Noun
1. produced by or used in a reaction involving changes in atoms or molecules
(hypernym) material, stuff
(hyponym) explosive
Adjective
1. relating to or used in chemistry; "chemical engineer"; "chemical balance"
(synonym) chemic
(pertainym) chemistry, chemical science
2. of or made from or using substances produced by or used in reactions involving atomic or molecular changes; "chemical fertilizer"

(n.)
A substance used for producing a chemical effect; a reagent.
  

(a.)
Pertaining to chemistry; characterized or produced by the forces and operations of chemistry; employed in the processes of chemistry; as, chemical changes; chemical combinations.
  

1 of or pertaining to chemistry . 2. a substance.