adjective
(zoology, fish anatomy, embryology) Of or pertaining to a segment, below (more ventral than) the pharyngobranchial segment and above (more dorsal than) the ceratobranchial segment, on either side of a branchial arch (in a fish) or of a pharyngeal arch (in the embryo of a vertebrate).
noun
(zoology, fish anatomy) An epibranchial cartilage or bone.