calcium cyanamide

noun
a gray-black, often lumpy powder, CaCN 2 , unstable in water, obtained by heating calcium carbide and nitrogen; cyanamide: used chiefly as a fertilizer, herbicide, and intermediate in the synthesis of nitrogen compounds.
Origin:
1905–10

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World English Dictionary
calcium cyanamide
 
—n
a white crystalline compound formed by heating calcium carbide with nitrogen. It is important in the fixation of nitrogen and can be hydrolysed to ammonia or used as a fertilizer. Formula: CaCN2

Collins English Dictionary - Complete & Unabridged 10th Edition
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Term cyanamide is also used to designate calcium cyanamide.
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