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Definition of Alkaloid

Babylon English

(Chemistry) resembling an alkali; alkaline
any of a class of organic compounds which contain nitrogen and have a bitter taste (Chemistry)
Alkaloid Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
An organic base, especially one of a class of substances occurring ready formed in the tissues of plants and the bodies of animals.
Alt. of Alkaloidal
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
hEnglish - advanced version

\al"ka*loid\ (ăl"k&adot;*loid), alkaloidal \al`ka*loid"al\ (ăl`k&adot;*loid"al), ] a. [alkali + -oid: cf. f. alcaloïde.] pertaining to, resembling, or containing, alkali.
\al"ka*loid\ (ăl"k&adot;*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.

  similar words(1) 

 cadaveric alkaloid 
WordNet 2.0

1. natural nitrogen-containing bases found in plants
(hypernym) organic compound
(hyponym) atropine
Alkaloid Definition from Science & Technology Dictionaries & Glossaries
General Chemistry Glossary
 Say it 
A class of bitter-tasting, basic organic compounds with nitrogen-containing rings. Alkaloids often have powerful effects on living things. Examples are cocaine, nicotine, strychnine, caffeine , and morphine.
Alkaloid Definition from Encyclopedia Dictionaries & Glossaries
English Wikipedia - The Free Encyclopedia
Alkaloids are a group of naturally occurring chemical compounds  that contain mostly basic nitrogen atoms. This group also includes some related compounds with neutral and even weakly acidic properties. Some synthetic compounds of similar structure are also termed alkaloids. In addition to carbon, hydrogen and nitrogen, alkaloids may also contain oxygen, sulfur and, more rarely, other elements such as chlorine, bromine, and phosphorus.

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Alkaloid Definition from Medicine Dictionaries & Glossaries
NCI Dictionary of Cancer Terms
A member of a large group of chemicals that are made by plants and have nitrogen in them. Some alkaloids have been shown to work against cancer. 
A Service of the National Cancer Institute.
Dictionary of Medicine (Shahram)
similar to an alkali
one of many poisonous substances (such as atropine, morphine or quinine) found in plants and used as medicines
Hepatitis Central (TM) Liver Disease Medical Glossary
Any of a large class of nitrogen-containing organic compounds found especially in seed plants
Aids Glossary
a complex organic compound derived from plants that contains nitrogen; many alkaloids have pharmacological effects.