The term chemical substance is a precise technical term that is synonymous with chemical for chemists. The word chemical is used in general usage in the English speaking world to refer to both (pure) chemical substances and mixtures (often called compounds),[1] and especially when produced or purified in a laboratory or an industrial process.[2][3][4][5]

Graduated cylinders and a large beaker filled with some type of chemical compounds. Credit: Horia Varlan.{{free media}}
Steam and liquid water are two different forms of the same chemical (pure) substance: water. Credit: Markus Schweiss.{{free media}}

Def. Phytochemicals are chemicals of plant origin.[6][7]

Phytochemicals are chemicals produced by plants through primary or secondary metabolism.[8][9] They generally have biological activity in the plant host and play a role in plant growth or defense against competitors, pathogens, or predators.[8]

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  1. "compound, In: Oxford Online Dictionaries". 2017-11-07.
  2. "chemical, In: Oxford Online Dictionaries". 2017-11-07.
  3. "chemical, In: Random House Unabridged Dictionary". 2017-11-07.
  4. "What is a chemical". 2005-06-01. Retrieved 6 June 2013. {{cite web}}: |archive-date= requires |archive-url= (help)
  5. Wikipedia: Chemical substance
  6. Breslin, Andrew (2017). "The Chemical Composition of Green Plants". Sciencing, Leaf Group Ltd.
  7. Wikipedia: Phytochemical
  8. 8.0 8.1 Molyneux, RJ; Lee, ST; Gardner, DR; Panter, KE; James, LF (2007). "Phytochemicals: the good, the bad and the ugly?". Phytochemistry 68 (22–24): 2973–85. doi:10.1016/j.phytochem.2007.09.004. PMID 17950388. 
  9. Harborne, Jeffrey B.; Baxter, Herbert; Moss, Gerard P., eds (1999). "General Introduction". Phytochemical dictionary a handbook of bioactive compounds from plants (2nd ed.). London: Taylor & Francis. p. vii. ISBN 9780203483756.