calcium carbide

noun
a grayish-black, lumpy, crystalline powder, CaC 2 , usually derived from coke or anthracite by reaction with limestone or quicklime: used chiefly for the generation of acetylene, which it yields upon decomposing in water.
Also called carbide.


Origin:
1885–90

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World English Dictionary
calcium carbide
 
n
Sometimes shortened to: carbide a grey salt of calcium used in the production of acetylene (by its reaction with water) and calcium cyanamide. Formula: CaC2

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Take care to not allow any grains of calcium carbide to accidentally fall into
  the lab drain.
Calcium carbide was metered in at a controlled rate based on generator pressure.
It used calcium carbide and water to produce acetylene and was self-regulated.
The potentially responsible parties also treated and disposed of gas cylinders
  and treated calcium carbide.
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