pertaining to, situated at, or forming, the base or posterior part of, the branchial arch (in fishes), the skull, the face, the hyoid bone, the occiput, the ray or radius, the beak, the sphenoid bone, the temples, the vertebræ.
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1873 St. G. MivartLessons Elem. Anat. xii. 477 The branchial arches..are attached to a..series of pieces termed basi-branchials.