[sil.i.ca] n [NL, fr. L silic-, silex hard stone, flint] (ca. 1801): silicon dioxide occurring in crystalline, amorphous, and impure forms (as in quartz, opal, and sand respectively)
SILICA
Meaning of SILICA in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012