noun. a mixture of oxygen and acetylene; used to create high temperatures for cutting or welding metals.
1. Noun, singular or mass Start the flow of acetylene to the oxyacetylene torch by turning the valve connected to the red hose counterclockwise 1/2 turn. 2. Adjective Penetrating lubricant in liberal doses may help in this manner, but if you have a small propane or oxyacetylene torch, you can also heat the edges of the bung on the exhaust pipe.