The Collaborative International Dictionary
Quadratojugal bone
Quadratojugal \Quad*ra`to*ju"gal\, a. (Anat.)
Of or pertaining to the quadrate and jugal bones.
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Of or pertaining to the quadratojugal bone. -- n. The quadratojugal bone.
Quadratojugal bone (Anat.), a bone at the base of the lower jaw in many animals.
Wikipedia
Quadratojugal bone
The quadratojugal is a small jaw bone that is present in most amphibians, reptiles and birds, but has been lost in mammals. It is connected to the jugal as well as other bones, though these may vary with species.
The quadratojugal bone is a small bone between the cheek and otic notch. Squamates ( lizards and snakes) lack a quadratojugal bone.