Alkaloid. Alkaloids are a group of naturally occurring chemical compounds that contain mostly basic nitrogen atoms. This group also includes some related compounds with neutral and even weakly acidic properties. Some synthetic compounds of similar structure are also attributed to alkaloids.
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Alkaloid: A member of a large group of chemicals that are made by plants and have nitrogen in them. Many alkaloids possess potent pharmacologic effects. The alkaloids include cocaine, nicotine, strychnine, caffeine, morphine, pilocarpine, atropine, methamphetamine, mescaline, ephedrine, and tryptamine.
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1 NICOTINE, C10H14N2, an alkaloid, found with small quantities of nicotimine, C 19 H 14 N 2, nicoteine, C10H12N2, and nicotelline, C 10 H 8 N 2, in tobacco.
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Two of the alkaloids, codeine and morphine, are used clinically for the relief of pain, but their use entails the risk of physical or psychologic dependence. Morphine is the standard against which the analgesic effect of newer drugs for relief of pain is measured. The opium alkaloids and their semisynthetic derivatives, including heroin, act on the central nervous system, producing analgesia, change in mood, drowsiness, and mental slowness.
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The term is also applied to synthetic substances which have structures similar to plant alkaloids, such as procaine. Please contribute to this project, if you have more information about this term feel free to edit this page. This page was last modified on 3 October 2005, at 21:16.This page has been accessed 20,420 times. What links here | Related changes | Permanent link.
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The use of morphine as an antidiarrheal preceded its use as an analgesic by hundreds of years. Prepared in a tincture, it remains the most effective constipating agent available. Papaverine, another opium alkaloid, does not cause analgesia but is used clinically as a vasodilator.
http://medical-dictionary.thefreedictionary.com/opium+alkaloid
Sentence Examples. » more... 1  NICOTINE, C10H14N2, an alkaloid, found with small quantities of nicotimine, C 19 H 14 N 2, nicoteine, C10H12N2, and nicotelline, C 10 H 8 N 2, in tobacco.
http://www.yourdictionary.com/alkaloid
Alkaloid. (Science: chemistry, pharmacology) One of a large group of nitrogenous substances found in naturally in plants. They are usually very bitter and although the plant may be poisonous, many have extracts that are pharmacologically active. Examples are atropine, caffeine, coniine, morphine, nicotine, quinine, strychnine.
http://www.biology-online.org/dictionary/Alkaloid
Wiktionary (0.00 / 0 votes) Rate this definition: alkaloid (Noun). Any of many organic heterocyclic bases, that occur in nature and often have medicinal properties. Origin: . Compare French alcaloide. alcaloïde
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opium alkaloid, one of several alkaloids isolated from the milky exudate of the unripe seed pods of Papaver somniferum, a species of poppy indigenous to the Near East.
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define alkaloid
The alkaloid is one of a large group of nitrogenous substances found in naturally in plants.