strontium strontitic • strontium 90 · · · Info · Definitions · Synonyms · Characters · · strontium · · Text Latin · · Script 9 · · Length 3 · · Syllables Definitions · · · (noun) a soft silver-white or yellowish metallic element of the alkali metal group; turns yellow in air; occurs in celestite and strontianite. Synonyms: Sr, atomic number 38. · · Noun Definition 1 Synonyms · · · sr · · Synonym 1 atomic number 38 · · Synonym 2 Characters · · i latin small letter i U+0069 m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 u latin small letter u U+0075