This word is not acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. The broadest muscle which lies upon the back; one of the muscles of the anterior extremity, arising from the spines of numerous vertebræ, and some other parts, and inserted into the upper part of the humerus: commonly called more fully latissimus dorsi. See cut under muscle.

"From its wide expanse on the back it is known as the latissimus dorsi"

latissimus colli   

longissimus    extra-ocular    ciliary    dilator    puborectalis