I. (ˈ) ̷ ̷+ adjective
Etymology: post- + orbital
: situated behind the orbit
the postorbital scales of some fishes and reptiles
a. : being a downwardly directed process of the frontal bone of many mammals and birds that forms part of the outer or posterior border of the orbit and in some lower vertebrates is borne on or represented by the postfrontal bone
b. : being a bone behind and below the postfrontal in many reptiles that forms part of the boundary of the orbit
II. noun
: a postorbital part (as a bone or scale)