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alkaloid

alkaloid is defined in Webster's Unabridged Dictionary (1913) with 2 senses. The full text of each entry is reproduced verbatim below.

Definitions

  1. 1.An organic base, especially one of a class of substances occurring ready formed in the tissues of plants and the bodies of animals. Note: Alcaloids 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.
  2. 2.Pertaining to, resembling, or containing, alkali.

Source: Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).

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