1. Relating to branchiae or gills. 2. In embryology, denoting the various structures constituting the b. apparatus.
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bran·chi·al -kē-əl adj of or relating to the gills or to parts of the body derived from the embryonic branchial arches and clefts
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bran·chi·al (brangґke-əl) pertaining to or resembling the gills of a fish or the derivatives of homologous parts in other animals.Medical dictionary. 2011.