nic·o·tine 
(nĭkə-tēn′)
(nĭkə-tēn′)n.
A toxic alkaloid, C10H14N2, that is found in the tobacco plant, constitutes the primary addictive substance in tobacco products, and acts as a stimulant at low doses.
[French, from New Latin nicotiāna, nicotiana; see NICOTIANA.]
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