Definitions
a sandstone that withstands intense heat; used to line fireplaces and furnaces and kilns
Word origin
Translation of the German toponymic surname Feuerstein, from Feuer (“fire”) + Stein (“stone”). Doublet of Feuerstein.
Used in a sentence
“On the descent the line is often in cuttings; some are high, such as at Scarcroft, where a cut through firestone and fireclay was necessary, and near Bardsey, where the line threads a deep tree-lined gorge.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Heatproof rock”9 letters
Not quite right?
"Search similar patterns."
F________