| 单词 | nicotine |
| 释义 | nicotine (once / 8324 pages) n Nicotine is a drug that's present in tobacco. People who are addicted to cigarettes are really hooked on nicotine. Nicotine is most commonly known for occurring in tobacco, and therefore in cigarettes. In small amounts, nicotine is a stimulant, although in larger quantities it's considered a poison and is even used in many insecticides. The earliest French root of the word was nicotiane, which comes from the Modern Latin botanical term for the tobacco plant, Nicotiana, named for Jean Nicot, the French ambassador who first brought tobacco from Brazil to France in 1561. WORD FAMILYnicotine USAGE EXAMPLESPowered by a battery, e-cigarettes turn liquid nicotine into an inhalable vapor without the harmful tar generated by regular cigarettes. Washington Times(Dec 16, 2016) But even in fetuses, the evidence for the harms associated with nicotine exposure is not enough to point toward causality. Slate(Dec 13, 2016) Officials say people who need help quitting tobacco or nicotine should talk to their doctor. Washington Times(Dec 10, 2016) n an alkaloid poison that occurs in tobacco; used in medicine and as an insecticide Hyper pressor, vasoconstrictive, vasoconstrictor any agent that causes a narrowing of an opening of a blood vessel: cold or stress or nicotine or epinephrine or norepinephrine or angiotensin or vasopressin or certain drugs; maintains or increases blood pressure alkaloidnatural bases containing nitrogen found in plants phytotoxin, plant toxinany substance produced by plants that is similar in its properties to extracellular bacterial toxin |
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