pubis
noun
that part of either innominate bone that, with the corresponding part of the other, forms the front of the pelvis.
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Some follow the Amphibian nomenclature, and unite the ischium and pubis into one bone, which is then termed ischium, when the prepubis is termed the pubis, and regarded as removed from the acetabulum.
From Dragons of the Air An Account of Extinct Flying Reptiles by H. G. Seeley