noun
: colloidal silica in the form of a fine lightweight powder with grains having minute pores that is made from silica gel and used chiefly as thermal insulation especially at low temperatures (as in refrigerators)
noun
: colloidal silica in the form of a fine lightweight powder with grains having minute pores that is made from silica gel and used chiefly as thermal insulation especially at low temperatures (as in refrigerators)
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012