terbium terbinafine • terbium metal · · · Info · Definitions · Synonyms · Characters · · terbium · · Text Latin · · Script 7 · · Length 3 · · Syllables Definitions · · · (noun) a metallic element of the rare earth group; used in lasers; occurs in apatite and monazite and xenotime and ytterbite. Synonyms: Tb, atomic number 65. · · Noun Definition 1 Synonyms · · · tb · · Synonym 1 atomic number 65 · · Synonym 2 Characters · · b latin small letter b U+0062 e latin small letter e U+0065 i latin small letter i U+0069 m latin small letter m U+006D r latin small letter r U+0072 t latin small letter t U+0074 u latin small letter u U+0075