(fyz) noun
1. Electr. A protective device of fusible metal set in a circuit so as to be directly heated and destroyed by the passage of an excess current through it.
2. A textile cord, ribbon, or the like impregnated with combustible material for communicating fire to explosives, as in mining, blasting, and pyrotechnics; black match: distinguished from fuze. [<Ital. fuso <L fusus a spindle]

(fyz) v.t. & v.i. fused, fus·ing
1. To liquefy by heat; melt.
2. To join or cause to join as if by melting together. See synonyms under MELT, MIX, UNITE. [<L fusus, pp. of fundere pour]