melter

transitive verb, intransitive verb

1. to change from a solid to a liquid state, generally by heat
2. to dissolve; disintegrate
3. to disappear or cause to disappear gradually: often with away
4. to merge gradually; blend: the sea melting into the sky
5. to soften; make or become gentle and tender: a story to melt our hearts

noun

1. a melting or being melted
2. something melted
3. the quantity melted at one operation or during one period
4. a dish, esp. a grilled sandwich, containing or covered with a layer of melted cheese: a tuna melt