Meaning of TUFF in English

TUFF

noun Etymology: earlier tuph, tuft porous rock, from Middle French tuf, from Old Italian tufo Date: 1815 a rock composed of the finer kinds of volcanic detritus usually fused together by heat, ~aceous adjective

Merriam Webster. Explanatory English dictionary Merriam Webster.      Толковый словарь английского языка Мерриам-Уэбстер.