Webster’s Revised Unabridged Dictionary · 1913
Hypobranchial
Hy′po·bran′chi·al (hī′pō·brăn̲′kĭ·al), a. [Pref. hypo- + branchial.] (Anat.) Pertaining to the segment between the basibranchial and the ceratobranchial in a branchial arch. — n. A hypobranchial bone or cartilage.