Definify.com
Webster 1913 Edition
Sternomastoid
Sterˊno-mas′toid
,Adj.
 (Anat.) 
Of or pertaining to the sternum and the mastoid process. 
Definition 2025
sternomastoid
sternomastoid
English
Adjective
sternomastoid (comparative more sternomastoid, superlative most sternomastoid)
- (anatomy) Of or pertaining to the sternum and the mastoid process