[ok-see-uh-set-l-een, -in]
noting or pertaining to a mixture of oxygen and acetylene: an oxyacetylene torch.
a mixture of oxygen and acetylene, used in a blowtorch for cutting steel plates or the like.

1905–10; oxy-2 + acetylene

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World English Dictionary
oxyacetylene (ˌɒksɪəˈsɛtɪˌliːn)
a.  a mixture of oxygen and acetylene; used in a blowpipe for cutting or welding metals at high temperatures
 b.  (as modifier): an oxyacetylene burner

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Things look bleak until they discover an oxyacetylene torch, some sheets of
  metal, a screwdriver and a car engine.
Cutting typically involves use of an oxyacetylene torch.
Methods and techniques of arc and oxyacetylene welding, particularly as applied
  to field situations.
The oxyacetylene equipment will not leak and will operate safely according to
  the manufacturer's specifications.
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