noun Date: 1869 a slag low in silica and high in base-forming oxides that is used in the basic process of steelmaking and that is subsequently useful as a fertilizer
BASIC SLAG
Meaning of BASIC SLAG in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012