cleido-mastoid, a. (n.) Anat.
(klaɪdəʊˈmæstɔɪd)
[f. Gr. κλείς, κλειδ- key, clavicle + mastoid.]
Pertaining to the clavicle and mastoid process; applied to the posterior part of the sterno-cleido-mastoid muscle.
| 1847–9 Todd Cycl. Anat. IV. 725/1 That part..becomes confounded with the deltoid and with the cleido-mastoid. 1882 in Syd. Soc. Lex. |