Definition of nicotine in English:

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Pronunciation: /ˈnikəˌtēn/


A toxic colorless or yellowish oily liquid that is the chief active constituent of tobacco. It acts as a stimulant in small doses, but in larger amounts blocks the action of autonomic nerve and skeletal muscle cells. Nicotine is also used in insecticides.
  • An alkaloid; chemical formula: C10H14N2.
Example sentences
  • The nicotine in tobacco smoke causes both physical and psychological dependence.
  • These laws offer a promising framework for the regulation of nicotine, including tobacco products.
  • I understand these results are based on the amount of nicotine found in the bloodstream.


Early 19th century: from French, from nicotiana + -ine4.

For editors and proofreaders

Syllabification: nic·o·tine

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