
Lactucin is a bitter substance that forms a white crystalline solid and belongs to the group of sesquiterpene lactones. It is found in some varieties of lettuce and is an ingredient of lactucarium. It has been shown to have analgesic and sedative properties. It has also shown some antimalarial effects. It is also found in dandelion coffee. It acts...
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http://en.wikipedia.org/wiki/Lactucin

• (n.) A white, crystalline substance, having a bitter taste and a neutral reaction, and forming one of the essential ingredients of lactucarium.
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http://thinkexist.com/dictionary/meaning/lactucin/
Lac·tu'cin noun [ From
Lactuca : confer French
lactucine .]
(Chemistry) A white, crystalline substance, having a bitter taste and a neutral reaction, and forming one of the essential ingredients of lactucarium.
Found on
http://www.encyclo.co.uk/webster/L/5
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