pisolitePronunciation: /ˈpɪzəlʌɪt, ˈpʌɪsə-/Definition of pisolite noun [mass noun] Geology a sedimentary rock, especially limestone, made up of small pea-shaped pieces. Derivatives pisoliticPronunciation: /-ˈlɪtɪk/ adjective Origin: early 19th century: from modern Latin pisolithus (see pisolith) + -litepisolite in other Oxford dictionaries Definition of pisolite in the US English dictionary