noun Etymology: 1fuller; from its earlier use as fulling agent Date: 15th century an earthy substance that consists chiefly of clay mineral but lacks plasticity and that is used as an adsorbent, a filter medium, and a carrier for catalysts
FULLER'S EARTH
Meaning of FULLER'S EARTH in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012