pyrargyritePronunciation: /pʌɪˈrɑːdʒɪrʌɪt/Definition of pyrargyrite noun [mass noun] a dark reddish-grey mineral consisting of a sulphide of silver and antimony. Origin: mid 19th century: from Greek puro- (from pur 'fire') + arguros 'silver' + -ite1pyrargyrite in other Oxford dictionaries Definition of pyrargyrite in the US English dictionary