Entry 1 sense Webster, 1913 Stylomastoid · Sty·lo·mas·toid · IPA /ˌstaɪ.loʊˈmæˌstɔɪd/ 01 a. Of or pertaining to the styloid and mastoid processes of the temporal bone. 1. Of or pertaining to the styloid and mastoid processes of the temporal bone.(Anat.)