| Meaning | Natural bases containing nitrogen found in plants. |
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| Narrower | atropine | A poisonous crystalline alkaloid extracted from the nightshade family |
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| betaine | A sweet tasting alkaloid that occurs in sugar beets |
| brucine | A bitter alkaloid poison resembling strychnine and extracted from nux vomica |
| caffeine, caffein | A bitter alkaloid found in coffee and tea that is responsible for their stimulating effects |
| 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 |
| ergonovine, Ergotrate Maleate | An alkaloid derived from ergot (trade name Ergotrate Maleate) that is less toxic than ergot |
| ergotamine | An alkaloid derived from ergot that is less toxic than ergot |
| hyoscyamine | A poisonous crystalline alkaloid (isometric with atropine but more potent) |
| nicotine | An alkaloid poison that occurs in tobacco |
| physostigmine | Used in treatment of Alzheimer's disease and glaucoma |
| pilocarpine | cholinergic alkaloid used in eyedrops to treat glaucoma |
| pseudoephedrine | poisonous crystalline alkaloid occurring with ephedrine and isomorphic with it |
| rauwolfia | Any of several alkaloids extracted from the shrub Rauwolfia serpentina |
| scopolamine, hyoscine | An alkaloid with anticholinergic effects that is used as a sedative and to treat nausea and to dilate the pupils in ophthalmic procedures |
| strychnine | An alkaloid plant toxin extracted chiefly from nux vomica |
| tubocurarine, curare | A toxic alkaloid found in certain tropical South American trees that is a powerful relaxant for striated muscles |
| Broader | organic compound | Any compound of carbon and another element or a radical |
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| Spanish | alcaloide |
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| Catalan | alcaloide |
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| Adjectives | alkaloidal | pertaining to or consisting of alkaloids |
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