Pronunciation: (blō'ing),[key] —n. 1. the sound of any vapor or gas issuing from a vent under pressure.
2. Metall.a disturbance caused by gas or steam blowing through molten metal.
3. Also calledblow molding. a method of producing hollowware by injecting air under pressure into a molten mass, as of glass or plastic, and shaping the material within a mold.