micaPronunciation: /ˈmʌɪkə/Definition of mica noun [mass noun] a shiny silicate mineral with a layered structure, found as minute scales in granite and other rocks, or as crystals. It is used as a thermal or electrical insulator. Derivatives micaceousPronunciation: /mɪˈkeɪʃəs/ adjective Origin: early 18th century: from Latin, literally 'crumb'mica in other Oxford dictionaries Definition of mica in the US English dictionary
