• (n.) A hypobranchial bone or cartilage. • (a.) Pertaining to the segment between the basibranchial and the ceratobranchial in a branchial arch.
Hy`po·bran'chi·al adjective [ Prefix hypo- + branchial .] (Anat.) Pertaining to the segment between the basibranchial and the ceratobranchial in a branchial arch. -- noun A hypobranchial bone or cartilage. 
Type: Term Pronunciation: hī′pō-brang′kē-ăl Synonyms: hypopharyngeal
situated below the gills or beneath the branchial arches.