The quality or degree to which something can be fused or melted together, especially in metallurgy and materials science.
From fusible (able to be fused) plus suffix -ity (quality of). Fusible derives from Latin fusus (melted), with -ible meaning 'able to be.'
Metallurgists measure fusibility to predict how metals will behave—it's why some alloys weld beautifully while others crack, a property that changed everything from bridges to spacecraft.
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