0 the process of forming something by forcing or pushing it out, especially through a small opening:
The lava dome in the 8,364-foot mountain may be weakened and more likely to allow an explosion or extrusion of lava.
He began to sweat, a weird cold extrusion of moisture that began to trickle down his face.
The company is an industrial manufacturer of aluminum extrusions.
Extrusions are limited to straight lines and arcs, so you can't create spirals this way.
