CASSITERITE Meaning of CASSITERITE in English [ kə'sɪtərʌɪt ]■ noun a reddish, brownish, or yellowish mineral consisting of tin dioxide.OriginC19: from Gk kassiteros 'tin' + -ite 1 . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004