alkaloid

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al·ka·loid

 (ăl′kə-loid′)
n.
Any of various organic compounds that are usually basic and contain at least one nitrogen atom in a heterocyclic ring, occurring chiefly in flowering plants. Many alkaloids, such as nicotine, quinine, cocaine, and morphine, are known for their poisonous or medicinal attributes.


al′ka·loi′dal (-loid′l) adj.

alkaloid

(ˈælkəˌlɔɪd)
n
(Elements & Compounds) any of a group of nitrogenous basic compounds found in plants, typically insoluble in water and physiologically active. Common examples are morphine, strychnine, quinine, nicotine, and caffeine

al•ka•loid

(ˈæl kəˌlɔɪd)
n.
1. any of a large class of bitter-tasting, nitrogen-containing, alkaline ring compounds common in plants and including caffeine, morphine, nicotine, quinine, and strychnine.
adj.
2. resembling an alkali; alkaline.
[1825–35]
al`ka•loi′dal, adj.

al·ka·loid

(ăl′kə-loid′)
Any of a large class of complex organic compounds that contain nitrogen and mostly occur in plants. Alkaloids have a wide range of physiological effects and many uses in medicine, but they can also be toxic. Morphine, quinine, and nicotine are all alkaloids.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.alkaloid - natural bases containing nitrogen found in plants
atropine - a poisonous crystalline alkaloid extracted from the nightshade family; used as an antispasmodic and to dilate the eye pupil; also administered in large amounts as an antidote for organophosphate nerve agents or organophosphate insecticides
hyoscyamine - a poisonous crystalline alkaloid (isometric with atropine but more potent); used to treat excess motility of the gastrointestinal tract
pilocarpine - cholinergic alkaloid used in eyedrops to treat glaucoma
hyoscine, scopolamine - an alkaloid with anticholinergic effects that is used as a sedative and to treat nausea and to dilate the pupils in ophthalmic procedures; "transdermal scopolamine is used to treat motion sickness"; "someone sedated with scopolamine has difficulty lying"
physostigmine - used in treatment of Alzheimer's disease and glaucoma
cinchonine - an alkaloid derivative of the bark of cinchona trees that is used as an antimalarial drug
ephedrine - white odorless powdered or crystalline alkaloid from plants of the genus Ephedra (especially Ephedra sinica) or made synthetically; used as a bronchodilator to treat bronchitis and asthma
ergonovine, Ergotrate Maleate - an alkaloid derived from ergot (trade name Ergotrate Maleate) that is less toxic than ergot; induces muscular contraction of the uterus and is administered after childbirth or abortion
ergotamine - an alkaloid derived from ergot that is less toxic than ergot; causes constriction of blood vessels and is used to treat migraine
pseudoephedrine - poisonous crystalline alkaloid occurring with ephedrine and isomorphic with it
nicotine - an alkaloid poison that occurs in tobacco; used in medicine and as an insecticide
strychnine - an alkaloid plant toxin extracted chiefly from nux vomica; formerly used as a stimulant
brucine - a bitter alkaloid poison resembling strychnine and extracted from nux vomica
betaine - a sweet tasting alkaloid that occurs in sugar beets
organic compound - any compound of carbon and another element or a radical
caffein, caffeine - a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects
rauwolfia - any of several alkaloids extracted from the shrub Rauwolfia serpentina
curare, tubocurarine - a toxic alkaloid found in certain tropical South American trees that is a powerful relaxant for striated muscles; "curare acts by blocking cholinergic transmission at the myoneural junction"
Translations
alkaloid
alkaloid

alkaloid

[ˈælkəlɔɪd]
A. ADJalcaloideo
B. Nalcaloide m

alkaloid

nAlkaloid nt

al·ka·loid

n. alcaloide, grupo de sustancias orgánicas básicas de origen vegetal.
References in periodicals archive ?
Anti-prostate cancer activity of beta-carboline alkaloid enriched extract from Rauwolfia vomitoria.
The beta-carboline alkaloid Harmine inhibits BCRP and can reverse resistance to the anticancer drugs mitoxanthrone and camptothccin.
In vitro antiinflammatory effects of beta-carboline alkaloids, isolated from Picrasma quassioides, through inhibition of the iNOS pathway.