One of the mysteries of the English language finally explained.
A hot and molten form of a substance which is usually solid at room temperature; (in later use also) an adhesive, coating, etc., which is applied in a heated molten state and which sets as it cools.
Solid at normal temperatures but capable of being melted for application, e.g. as a coating.
Early 20th century; earliest use found in U.S. Patents.
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