sternum sternson • sternutation · · · Info · Definitions · Synonyms · Characters · · sternum · · Text Latin · · Script 7 · · Length Definitions · · · (noun) the flat bone that articulates with the clavicles and the first seven pairs of ribs. Synonyms: breastbone. · · Noun Definition 1 Synonyms · · · breastbone · · Synonym 1 Characters · · e latin small letter e U+0065 m latin small letter m U+006D n latin small letter n U+006E 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