lutetium Lutetian • lute-voiced · · · Info · Definitions · Synonyms · Characters · · lutetium · · Text Latin · · Script 8 · · Length 4 · · Syllables Definitions · · · (noun) a trivalent metallic element of the rare earth group; usually occurs in association with yttrium. Synonyms: lutecium, Lu, atomic number 71. · · Noun Definition 1 Synonyms · · · lutecium · · Synonym 1 lu · · Synonym 2 atomic number 71 · · Synonym 3 Characters · · e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D t latin small letter t U+0074 u latin small letter u U+0075