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Old English meltan "become liquid, consume by fire, burn up" (class III strong verb; past tense mealt, past participle molten), from Proto-Germanic *meltanan; fused with Old English gemæltan (Anglian), gemyltan (West Saxon) "make liquid," from Proto-Germanic *gamaltijanan (cf. Old Norse melta "to digest"), both from PIE *meldh-, (cf. Sanskrit mrduh "soft, mild," Greek meldein "to melt, make liquid," Latin mollis "soft, mild"), from root *mel- "soft," with derivatives referring to soft or softened (especially ground) materials (see mild). Figurative use by c.1200. Related: Melted; melting.
Of food, to melt in (one's) mouth is from 1690s. Melting pot is from 1540s; figurative use from 1855; popularized with reference to America by play "The Melting Pot" by Israel Zangwill (1908).
1854, "molten metal," from melt (v.). In reference to a type of sandwich topped by melted cheese, 1980, American English.
To change from a solid to a liquid state by heating or being heated with sufficient energy at the melting point. See also heat of fusion.