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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.


relating to alkaloids
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Adj.1.alkaloidal - pertaining to or consisting of alkaloids
References in periodicals archive ?
Sokolov, Alkaloidal Plants of the USSR, Academy of Sciences of the USSR, Moscow-liningrad (1952).
No significant differences in relative percentages of alkaloidal peaks were detected between the different extraction methods (Table 1).
Studies on the immunomodulatory effects of Boerhaavia diffusa alkaloidal fraction.
The isolation and structure of camptothecin, a novel alkaloidal leukemia and tumor inhibitor from Camptotheca acuminata.
Vincristine is an alkaloidal constituent isolated from Catharanthus roseus (Madagascar periwinkle), also known as Vinca rosea.
Comparative studies of the alkaloidal composition of two Mexican Erythrina species and nutritive value of detoxified seeds.
Antimicrobial activity of the alkaloidal comtituents of the root bark of Eupomatia lourina.
Larvicidal effect ofan alkaloidal fraction of Artabotrys odoratissimus (Annonaceae) bark against the filarial mosquito Culex quinquefasciatus (Diptera: Culicidae).
Chemical defense: Bestowal of a nuptial alkaloidal garment by a male moth on its mate.