quadratojugals

Noun

quadratojugal (plural quadratojugals)

1. A small jaw bone found in the skull of most reptiles, amphibians and birds.
   • The quadratojugals are relatively large in the primitive skull, sometimes forming a part of the articular surface for the mandible (Fig. 21 b). In the single-arched skull the quadratojugal tends to disappear. It is probably present in all Theromorpha, but is often confined chiefly to the posterior...1925, Samuel Wendell Williston, “Chapter 1”, in The Osteology of the Reptiles

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