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Definition of Ultimobranchial
1. Adjective. (anatomy) Designating the fifth (last) pharyngeal pouch of the embryo ¹
¹ Source: wiktionary.com
Medical Definition of Ultimobranchial
1. In embryology, relating to the caudal pharyngeal pouch. Origin: L. Ultimus, last, + G. Branchia, gills (05 Mar 2000)