Hypertext Webster Gateway: "alkaloid"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Alkaloid \Al"ka*loid\ ([a^]l"k[.a]*loid), n. (Chem.)
An organic base, especially one of a class of substances
occurring ready formed in the tissues of plants and the
bodies of animals.
Note: Alkaloids 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.
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Alkaloid \Al"ka*loid\ ([a^]l"k[.a]*loid), Alkaloidal
\Al`ka*loid"al\ ([a^]l`k[.a]*loid"al), a. [Alkali + -oid: cf. F.
alcalo["i]de.]
Pertaining to, resembling, or containing, alkali.
From WordNet (r) 1.7 (wn)
alkaloid
n : natural nitrogen-containing bases found in plants
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