In embryology, relating to the caudal-most pharyngeal pouch. [L. ultimus, last, + G. branchia, gills]
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ul·ti·mo·bran·chi·al .əl-tə-mō-'braŋ-kē-əl adj being, relating to, produced by, or derived from the ultimobranchial bodies
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ul·ti·mo·bran·chi·al (ul″tĭ-mo-brangґke-əl) [L. ultimus last + branchial] pertaining to or derived from the fourth pharyngeal pouch. Called also ultimopharyngeal.Medical dictionary. 2011.