pterygomaxillary UK /ˌtɛ.ɹɪɡ.ə(ʊ).makˈsɪl.ə.ɹi/US /ˌtɛɹ.əɡ.oʊˈmæk.səˌlɛɹ.i/ adjective1 •Of or pertaining to the pterygoid process of the sphenoid bone and the maxilla.