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Parent Categories

entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

physical entity go
an entity that has physical existence

matter go
that which has mass and occupies space

substance go
the real physical matter of which a person or thing consists

material, stuff go
the tangible substance that goes into the makeup of a physical object

chemical, chemical substance go
material produced by or used in a reaction involving changes in atoms or molecules

compound, chemical compound go
(chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight

organic compound go
any compound of carbon and another element or a radical

alkaloid
natural bases containing nitrogen found in plants

noun.substance

17 Subcategories

atropine go
a poisonous crystalline alkaloid extracted from the nightshade family
hyoscyamine go
a poisonous crystalline alkaloid (isometric with atropine but more potent)
pilocarpine go
cholinergic alkaloid used in eyedrops to treat glaucoma
scopolamine, hyoscine go
an alkaloid with anticholinergic effects that is used as a sedative and to treat nausea and to dilate the pupils in ophthalmic procedures
physostigmine go
used in treatment of Alzheimer's disease and glaucoma
cinchonine go
an alkaloid derivative of the bark of cinchona trees that is used as an antimalarial drug
ephedrine go
white odorless powdered or crystalline alkaloid from plants of the genus Ephedra (especially Ephedra sinica) or made synthetically
ergonovine, Ergotrate Maleate go
an alkaloid derived from ergot (trade name Ergotrate Maleate) that is less toxic than ergot
ergotamine go
an alkaloid derived from ergot that is less toxic than ergot
pseudoephedrine go
poisonous crystalline alkaloid occurring with ephedrine and isomorphic with it
nicotine go
an alkaloid poison that occurs in tobacco
strychnine go
an alkaloid plant toxin extracted chiefly from nux vomica
brucine go
a bitter alkaloid poison resembling strychnine and extracted from nux vomica
betaine go
a sweet tasting alkaloid that occurs in sugar beets
caffeine, caffein go
a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects
rauwolfia go
any of several alkaloids extracted from the shrub Rauwolfia serpentina
tubocurarine, curare go
a toxic alkaloid found in certain tropical South American trees that is a powerful relaxant for striated muscles