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alkalinise
Alkalinity
alkalinization
alkalinize
alkalinuria
Alkalious
Alkalis
alkalise
alkaliser
Alkalizate
Alkalization
Alkalize
Alkalized
alkalizer
Alkalizing
alkaloidal
alkalosis
alkalotic
alkaluria
alkane
alkane series
Alkanet
Alkanna tinctoria
alkapton
alkaptonuria
Alkargen

alkaloid definitions

WordNet (r) 3.0 (2005)

n
1: natural bases containing nitrogen found in plants

Merriam Webster's

noun Date: circa 1831 any of numerous usually colorless, complex, and bitter organic bases (as morphine or caffeine) containing nitrogen and usually oxygen that occur especially in seed plants and are typically physiologically active alkaloidal adjective

Britannica Concise

Basic (see base) organic compounds of plant origin, containing combined nitrogen. Alkaloids are amines, so their names usually end in "ine" (e.g., caffeine, nicotine, morphine, quinine). Most have complex chemical structures of multiple ring systems. They have diverse, important physiological effects on humans and other animals, but their functions in the plants that produce them are poorly understood. Some plants (e.g., opium poppy, ergot fungus) produce many different alkaloids, but most produce only one or a few. Certain plant families, incl. the poppy family (Papaveraceae) and the nightshade family (Solanaceae), are particularly rich in them. Alkaloids are extracted by dissolving the plant in dilute acid.

Oxford Reference Dictionary

n. any of a series of nitrogenous organic compounds of plant origin, many of which are used as drugs, e.g. morphine, quinine. Etymology: G (as ALKALI)

Webster's 1913 Dictionary

Alkaloid Al"ka*loid ([a^]l"k[.a]*loid), n. (Chem.) An organic base, especially one of a class of substances occurring ready formed in the tissues of plants and the bodies of animals. Note: Alkaloids all contain nitrogen, carbon, and hydrogen, and many of them also contain oxygen. They include many of the active principles in plants; thus, morphine and narcotine are alkaloids found in opium.

Webster's 1913 Dictionary

Alkaloid Al"ka*loid ([a^]l"k[.a]*loid), Alkaloidal Al`ka*loid"al ([a^]l`k[.a]*loid"al), a. [Alkali + -oid: cf. F. alcalo["i]de.] Pertaining to, resembling, or containing, alkali.




 


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