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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Alkaloid \Al"ka*loid\ ([a^]l"k[.a]*loid), Alkaloidal \Al'ka*loid"al\ ([a^]l'k[.a]*loid"al), adjective [Alkali + -oid: cf. F. alcalo["i]de.]
1. Pertaining to, resembling, or containing, alkali.
2. of or pertaining to alkaloids. [WordNet 1.5]
From The Collaborative International Dictionary of English v.0.44 [gcide]:
Alkaloid \Al"ka*loid\ ([a^]l"k[.a]*loid), noun (Chem.) An organic base, especially one of a class of nitrogen-containing 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 WordNet (r) 2.0 [wn]:
alkaloid
noun: natural nitrogen-containing bases found in plants
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