| Noun | 1. | 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" |