What does fusible mean?
'Fusible' describes a material's capacity to be melted or fused under heat. The word belongs mainly to technical registers: metallurgists rank metals by how fusible they are, engineers specify fusible alloys for solders and safety devices, and electricians install fusible links that intentionally melt during a current overload, sacrificing themselves to protect a circuit. In sewing, fusible interlining bonds to fabric when pressed with an iron. Its antonym is 'refractory' — stubbornly resistant to melting, like the ceramics lining a furnace. Derived ultimately from the Latin verb fundere, 'to pour or melt', it shares deep roots with words such as infuse, diffuse, transfuse, and fusion itself. A companion noun, fusibility, expresses the degree of meltability. Though rarely heard in casual speech, the word captures a property central to casting, soldering, fire safety, and any process where heat transforms solid into liquid.
adjectiveCapable of being melted or fused, especially by heat; liable to melt under sufficient heat.
- Capable of being melted or fused by heat (the standard sense, applied to metals, alloys, and other materials)
- Designed to melt at a specific temperature as a safety mechanism, as in a fusible link or fuse
"The fusible alloy in the circuit breaker melts when the current runs too hot."
"Brass is more fusible than iron, which is why it casts so readily."
"The electrician replaced the fusible link that had blown during the surge."
"Sewers use fusible interlining that bonds to fabric when pressed with a hot iron."
In electronics, a 'fusible link' is deliberately engineered to be weak — a tiny component designed to destroy itself so the rest of the circuit survives.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of fusible
Fusible derives from the Latin verb fundere ('to pour, melt'), via its past participle form fusus and the related stem underlying fusion. It entered English through scientific Latin usage, appearing in technical writing around the seventeenth century as chemistry and metallurgy developed their vocabulary. It shares this root with cognates such as infuse, diffuse, profuse, and transfuse, all built on the same pouring-and-melting stem.
Related word forms
How fusible is actually used
Mostly a technical term, common in metallurgy, electrical engineering, and textiles rather than everyday conversation. It carries no strong connotation — it simply describes a physical property. The noun derivative 'fusibility' refers to the degree to which a substance can be fused.
Easily confused with fusible
Fusion is the actual process or result of melting or joining materials, whereas fusible describes a material's capacity to be melted in the first place.