Meaning

noun hard volcanic rock composed of compacted volcanic ash

originEtymology tree Proto-Indo-European *tewh₂-der. Proto-Italic *tūβosder. Oscanbor.? Latin tōfusder. Italian tufobor. French tufbor. English tuff From French tuffe, tuf, from Italian tufo, from Latin tōfus. Doublet of tufa.

Etymology from Wiktionary, CC BY-SA 3.0