adj, noun ·Uncommon ·College level

Definitions

Noun

1. 1
   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."

2. 2
   natural bases containing nitrogen found in plants wordnet

Adjective

1. 1
   Relating to, resembling, or containing alkali.

Example

More examples

"Daffodils contain a toxic alkaloid that may even be lethal when ingested in high quantities."

Etymology

From alkali + -oid. Compare French alcaloïde.

Related phrases

cadaveric alkaloidharmala alkaloidindole alkaloidmorphine alkaloidnicotine alkaloidopium alkaloidpyrrolizidine alkaloidosislysergic acid

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.