picritePronunciation: /ˈpɪkrʌɪt/Definition of picrite noun [mass noun] Geology a dark basaltic igneous rock rich in olivine. Derivatives picriticPronunciation: /pɪˈkrɪtɪk/ adjective Origin: early 19th century: from Greek pikros 'bitter' + -ite1picrite in other Oxford dictionaries Definition of picrite in the US English dictionary