Definitions

1. adjective

Not capable of being fused or joined together, especially in a way that requires heat; not melt-proof or waterproof.

“The nonfusible tape was used to insulate the electrical wires in the building.”

2. noun

A material or coating that is not capable of being fused or joined together, especially in a way that requires heat.

“The nonfusible lining of the jacket helped to prevent water from penetrating to the inside.”