Definition Of alkaloid
any of a class of nitrogenous organic compounds of plant origin that have pronounced physiological actions on humans. They include many drugs (morphine, quinine) and poisons (atropine, strychnine).
Other important alkaloids are caffeine, ricinine, and quinine.
Example Of alkaloid
At present, the chemical components of this water extract are thought to include only alkaloids , terpenes and pigments.
Barbiturates are derived from barbituric acid, an alkaloid with nitrogen-containing rings.
Berberine is an alkaloid occurring in the plant genera Berberis and Coptis.
Caffeine is a bitter alkaloid found especially in coffee, tea, and kola nuts and used medicinally as a stimulant and diuretic.
Caffeine is a naturally occurring drug belonging to a group of compounds called alkaloids .