latissimusyoudaoicibaDictYouDict[latissimus 词源字典]
"Either of a pair of large, roughly triangular muscles covering the lower part of the back, extending from the sacral, lumbar, and lower thoracic vertebrae to the armpits", Early 17th century: modern Latin, from musculus latissimus dorsi, literally 'broadest muscle of the back'.[latissimus etymology, latissimus origin, 英语词源]