Entry 1 sense Webster, 1913 Ceratobranchial · Cer·a·to·bran·chi·al · IPA 01 a. Pertaining to the bone, or cartilage, below the epibranchial in a branchial arch. 1. Pertaining to the bone, or cartilage, below the epibranchial in a branchial arch.(Anat.)