Etymology From alkali + -oid. Compare French alcaloïde.
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Chemistry, Natural sciences, Organic chemistry, Physical sciences Any of many organic (often heterocyclic) bases that occur in nature and often have medicinal properties.
The Aspidosperma alkaloids are the largest group of indole alkaloids.1990, Song Liu, Syntheses of Aspidosperma Alkaloids, page 2:
Xanthosine, the initial substrate of purine alkaloid synthesis, is supplied by at least four different pathways […]2010, Bertil B. Fredholm, Methylxanthines: