alkaloid

A nitrogenous base. Usually refers to biologically active (toxic) molecules, produced as allelochemicals by plants to deter grazing. Examples: ouabain, digitalis

Alkaloid

A naturally occuring organic compound containing nitrogen that acts as a base. Many alkaloids are physiologically active and can be used in small quantities as medicines, but if taken in larger doses they can be extremely poisonous. An example is caffeine.

Alkaloid

A group of plant derived substances with toxic properties, eg. pyrethrum.

alkaloid

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.
Found on http://antoine.frostburg.edu/chem/senese/101/glossary/a.shtml

Alkaloid

Alkaloids are a group of naturally occurring chemical compounds (natural products) 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...
Found on http://en.wikipedia.org/wiki/Alkaloid

alkaloid

(al´kә-loid″) one of a large group of organic, basic substances found in plants. They are usually bitter in taste and are characterized by powerful physiologic activity. Examples are morphine, cocaine, atropine, quinine, nicotine, and caffeine. The term is also applied to synthetic substances that have...
Found on http://www.encyclo.co.uk/local/21001

alkaloid

(alkali + -oid) one of a large group of nitrogenous basis substances found in plants. They are usually very bitter and many are pharmacologically active. Examples are atropine, caffeine, coniine, morphine, nicotine, quinine, strychnine. The term is also applied to synthetic substances (artificial a's) which have structures similar to plant alkal......
Found on http://users.ugent.be/~rvdstich/eugloss/DIC/dictio04.html

alkaloid

[n] - natural nitrogen-containing bases found in plants
Found on http://www.webdictionary.co.uk/definition.php?query=alkaloid

Alkaloid

• (a.) Alt. of Alkaloidal • (n.) An organic base, especially one of a class of substances occurring ready formed in the tissues of plants and the bodies of animals.
Found on http://thinkexist.com/dictionary/meaning/alkaloid/

alkaloid

<chemistry, pharmacology> One of a large group of nitrogenous substances found in naturally in plants. They are usually very bitter and although the plant may be poisonous, many have extracts that are pharmacologically active. ... Examples are atropine, caffeine, coniine, morphine, nicotine, quinine, strychnine. The term is also applied to sy...
Found on http://www.encyclo.co.uk/local/20973

alkaloid

noun natural bases containing nitrogen found in plants
Found on https://www.encyclo.co.uk/local/20974

Alkaloid

Al'ka·loid (ăl'kȧ*loid), Al`ka*loid'al (ăl`kȧ*loid' a l) adjective [ Alkali + -oid : confer French alcaloïde .] Pertaining to, resembling, or containing, alkali.
Found on http://www.encyclo.co.uk/webster/A/56

Alkaloid

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.
Found on http://www.diracdelta.co.uk/science/source/a/l/alkaloid/source.html

Alkaloid

A class of bitter-tasting, basic organic compounds with nitrogen-containing rings. Alkaloids often h
Found on http://www.superglossary.com/Glossary/Science/Chemistry/

Alkaloid

A large, varied group of complex nitrogen-containing compounds, usually alkaline, that react with acids to form soluble salts, many of which have physiological effects on humans. Includes nicotine, cocaine, caffeine, etc.
Found on http://www.encyclo.co.uk/local/20900

alkaloid

A member of a large group of substances found in plants and in some fungi. Alkaloids contain nitrogen and can be made in the laboratory. Nicotine, caffeine, codeine, and vincristine are alkaloids. Some alkaloids, such as vincristine, are used to treat cancer.
Found on http://www.cancer.gov/dictionary?expand=A

alkaloid

A naturally occuring organic compound containing nitrogen that acts as a base. Many alkaloids are physiologically active and can be used in small quantities as medicines, but if taken in larger doses they can be extremely poisonous. An example is caffeine
Found on http://www.chemicalglossary.net/definition/97-Alkaloid

Alkaloid

Alkaloid is a term applied to a class of nitrogenous compounds having basic properties, found in living plants, usually in combination with organic acids. They are usually given names ending in ine, as morphine, quinine, aconitine, nicotine, caffeine, etc. Most alkaloids occur in plants, but some are formed by decomposition. Most natural alkaloids ...
Found on http://www.probertencyclopaedia.com/browse/GA.HTM

alkaloid

alkaloid, any of a class of organic compounds composed of carbon, hydrogen, nitrogen, and usually oxygen that are often derived from plants. Although the name means alkalilike, some alkaloids do not exhibit alkaline properties. Many alkaloids, though poisons, have physiological effects that render t...
Found on http://www.infoplease.com/ce6/sci/A0803363.html

Alkaloid

Alkaloid: A member of a large group of chemicals that are made by plants and have nitrogen in them. Many alkaloids possess potent pharmacologic effects. The alkaloids include cocaine, nicotine, strychnine, piperine, caffeine, morphine, pilocarpine, atropine, methamphetamine, mescaline, ephedrine, and tryptamine.
Found on http://www.medterms.com/script/main/art.asp?articlekey=25034

alkaloid

an organic compound found in plants.
Found on http://www.encyclo.co.uk/local/22225

alkaloid

any of a class of naturally occurring organic nitrogen-containing bases. Alkaloids have diverse and important physiological effects on humans and ... [10 related articles]
Found on http://www.britannica.com/eb/a-z/a/47

alkaloid

Any of a group of basic nitrogen-containing organic compounds (mostly heterocyclic) derived from plants and having diverse pharmacological properties. Alkaloids include morphine, cocaine, atropine, quinine, codeine, nicotine, and caffeine, some of which are used in medicine as analgesics, tranquiliz...
Found on http://www.daviddarling.info/encyclopedia/A/alkaloid.html

alkaloid

Any of a number of physiologically active and frequently poisonous substances contained in some plants. They are usually organic bases and contain nitrogen. They form salts with acids and, when soluble, give alkaline solutions. Substances in this group are included by custom rather than by scientific rules. Examples include morphine, cocaine, quini...
Found on http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0009896.html

alkaloid

Chemicals that are found naturally in plants with medicinal properties.
Found on http://www.buylowdrugs.com/pharmacy-articles/Glossary-of-Common-Medical-Ter
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