plumbago plumbaginous • plumbate · · · Info · Definitions · Synonyms · Characters · · plumbago · · Text Latin · · Script 8 · · Length Definitions · · · (noun) used as a lubricant and as a moderator in nuclear reactors. Synonyms: graphite, black lead. · · Noun Definition 1 (noun) any plumbaginaceous plant of the genus Plumbago. · · Noun Definition 2 Synonyms · · · graphite · · Synonym 1 black lead · · Synonym 2 Characters · · a latin small letter a U+0061 b latin small letter b U+0062 g latin small letter g U+0067 l latin small letter l U+006C m latin small letter m U+006D o latin small letter o U+006F p latin small letter p U+0070 u latin small letter u U+0075