tuff noun. [tʌf] M16.
[French tuffe, tuf(e from Italian tufo: see TUFA.]
Geology. A light porous cellular rock or tufa; now usu. spec., one formed by the consolidation of volcanic ash etc.

■ tuffaceous [tʌ'feɪʃǝs] adjective of the nature or texture of tuff L19.

[TahlilGaran] English Dictionary ▲

tuff verb intrans. [tʌf] rare. M16.
[Imit.]
Make a short explosive sound; puff.
■ F. Swinnerton His train's now tuffing in that long tunnel.

[TahlilGaran] English Dictionary ▲