from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A rock composed of compacted volcanic ash varying in size from fine sand to coarse gravel. Also called tufa.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. older and simplified spelling of tough
- n. A light porous rock, now especially a rock composed of compacted volcanic ash varying in size from fine sand to coarse gravel.
from the GNU version of the Collaborative International Dictionary of English
- n. Same as tufa.
from The Century Dictionary and Cyclopedia
- n. Same as tuft.
- An old spelling of tough.
- n. A volcanic fragmental rock, varying from coarse deposits made of materials resembling fine gravel in size to those which are like the finest sand.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. hard volcanic rock composed of compacted volcanic ash
French tuf, from Old French, from Old Italian tufo, tufa; see tufa.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Old English tōh, from Proto-Germanic *tanhuz (Wiktionary)
From French tuffe, tuf, from Italian tufo, from Latin tōfus. (Wiktionary)