latissimus dorsila·tis·si·mus dor·si
pl. la·tis′simi dor′si
either of the large, wide, triangular muscles, one on each side of the back, connecting the lower and central spine with the arm: it helps rotate, extend, and adduct the arm
Origin of latissimus dorsiModern Latin (musculus) latissimus dorsi, broadest (muscle) of the back
nounpl. la·tis·si·mi dorsi
Either of two broad, flat, triangular muscles with origin from the spinous processes of the lower thoracic and lumbar vertebrae, the sacrum, and the iliac crest, that insert into the humerus and whose action adducts, medially rotates, and extends the arm.
Origin of latissimus dorsiNew Latin latissimus dors&imacron; : Latin latissimus, superlative of latus, wide + Latin dors&imacron;, genitive of dorsum, back.
(plural latissimi dorsi)