[kem-i-kuh l]
  1. of, used in, produced by, or concerned with chemistry or chemicals: a chemical formula; chemical agents.
  2. used in chemical warfare: chemical weapons.

Origin of chemical

1570–80; chemic + -al1; replacing chimical chemic
Related formschem·i·cal·ly, adverbnon·chem·i·cal, adjective, nounpre·chem·i·cal, adjectivepseu·do·chem·i·cal, adjectivesem·i·chem·i·cal, adjectivesem·i·chem·i·cal·ly, adverbsu·per·chem·i·cal, adjective, nounsu·per·chem·i·cal·ly, adverbun·chem·i·cal, adjectiveun·chem·i·cal·ly, adverb Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Contemporary Examples of chemically

Historical Examples of chemically

British Dictionary definitions for chemically


  1. any substance used in or resulting from a reaction involving changes to atoms or molecules, especially one derived artificially for practical use
  1. of or used in chemistrychemical balance
  2. of, made from, or using chemicalschemical fertilizer
Derived Formschemically, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for chemically



1570s, "relating to chemistry," from chemic "of alchemy" (a worn-down derivative of Medieval Latin alchimicus; see alchemy) + -al (1). In early use also of alchemy. Related: Chemically.



1747, from chemical (adj.). Related: Chemicals.

Online Etymology Dictionary, © 2010 Douglas Harper

chemically in Medicine


  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.
Related formschemi•cal•ly adv.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

chemically in Science


  1. Relating to or produced by means of chemistry.
  1. A substance having a specific molecular composition, obtained by or used in a chemical process.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.