Entry 1 sense Webster, 1913 Epibranchial · Ep·i·bran·chi·al · IPA 01 a. Pertaining to the segment between the ceratobranchial and pharyngobranchial in a branchial arch. 1. Pertaining to the segment between the ceratobranchial and pharyngobranchial in a branchial arch.(Anat.)