Easton's Bible Dictionary (1897)
Solid; a stone, (2 Kings 19:12; Isa. 37:12), a fortress near Haran, probably on the west of the Euphrates, conquered by Sennacherib.
Smith's Bible Dictionary (1863)
(a hot stone), one of the places which Sennacherib mentions, in his taunting message to Hezekiah, as having been destroyed by his predecessor.
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
RE'ZEPH (stone heated for baking), a city which Sennacherib boasted to the Jews that he had subdued. 2 Kgs 19:12; Isa 37:12. Its site is perhaps at Rasapha, a day's march west of the Euphrates, on the road from Raca to Hums.
Hitchcock's Bible Names (1869)
pavement; burning coal