Blowtorch (noun)

A portable device that burns fuel and produces a flame and is used for heating, soldering, welding, or melting metal.

Origin:

From blow + torch, the word "torch" has its origin in old english "torch" meaning a stick of wood with one end wrapped in flammable material and used as a light.

Examples:

1. He used a blowtorch to heat the metal for welding.
2. She was soldering pipes with a blowtorch.
3. The chef used a blowtorch to caramelize the sugar on top of the creme brulee.
4. The blowtorch was used to thaw the frozen pipes.
5. The blowtorch was an essential tool for the metalworker.