aponeurosis
noun
apo·neu·ro·sis ˌa-pə-nu̇-ˈrō-səs 
-nyu̇-
: a broad flat sheet of dense fibrous collagenous connective tissue that covers, invests, and forms the terminations and attachments of various muscles
aponeurotic
ˌa-pə-nu-ˈrä-tik
adjective -nyu̇-
Example Sentences
Recent Examples on the Web The most popular kind of face-lift is known as the SMAS, which stands for subcutaneous muscular aponeurosis system. 
Jessica Matlin, Harper's BAZAAR, 29 Nov. 2021
Jessica Matlin, Harper's BAZAAR, 29 Nov. 2021 Word History
Etymology
New Latin, from Greek aponeurōsis, from aponeurousthai to pass into a tendon, from apo- + neuron sinew — more at nerve
First Known Use
1676, in the meaning defined above
Medical Definition
aponeurosis
noun
apo·neu·ro·sis ˌap-ə-n(y)u̇-ˈrō-səs
plural aponeuroses -ˌsēz
: any of the broad flat sheets of dense fibrous collagenous connective tissue that cover, invest, and form the terminations and attachments of various muscles