Webster's English Dictionary

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acetylene

acet.y.lene \*-'set-*l-*n, -*l-, e-n\ \*-.set-*l-'e--nik, -'en-ik\ n : a 
   colorless gaseous hydrocarbon Hc<triple-bond>ch made esp. by the a ction of 
   water on calcium carbide and used chiefly in welding and soldering and in 
   organic synthesis - acet.y.le.nic aj