Capable of being melted or fused; having the quality of being able to flow when heated.
From Latin fusilis, derived from fundere (to pour, melt). The term evolved in scientific contexts to describe materials that melt easily.
Glass makers and metallurgists use this term constantly—it's why some metals are 'fusile' and perfect for welding, while others are too brittle. The word literally describes materials that want to flow together when hot!
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