a substance produced by or used in a chemical process.
chemicals, Slang. narcotic or mind-altering drugs or substances.
of, used in, produced by, or concerned with chemistry or chemicals: a chemical formula; chemical agents.
used in chemical warfare: chemical weapons.

1570–80; chemic + -al1; replacing chimical chemic

chemically, adverb
nonchemical, adjective, noun
prechemical, adjective
pseudochemical, adjective
semichemical, adjective
semichemically, adverb
superchemical, adjective, noun
superchemically, adverb
unchemical, adjective
unchemically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
chemical (ˈkɛmɪkəl)
1.  any substance used in or resulting from a reaction involving changes to atoms or molecules, especially one derived artificially for practical use
2.  of or used in chemistry: chemical balance
3.  of, made from, or using chemicals: chemical fertilizer

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1576, from chemic "of alchemy" (a worn-down derivative of M.L. alchimicus; see alchemy) + -al (1).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

chemical chem·i·cal (kěm'ĭ-kəl)
Abbr. chem.

  1. Of or relating to chemistry.

  2. Of or relating to the properties or actions of chemicals.

  1. A substance with a distinct molecular composition that is produced by or used in a chemical process.

  2. A drug, especially an illicit or addictive one.

chem'i·cal·ly adv.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
chemical   (kěm'ĭ-kəl)  Pronunciation Key 
Adjective   Relating to or produced by means of chemistry.

Noun   A substance having a specific molecular composition, obtained by or used in a chemical process.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
But they had not yet succeeded in deducing the chemical properties of any molecules except the simplest hydrogen molecule.
Chemical companies that make products as varied as fertilizer and industrial
  solvents are overseen by other agencies.
Department secretaries transcribed them while he pored over chemical journals
  and planned his next article.
Most countries have now agreed to give up using or storing chemical weapons.
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