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brachial bra·chi·al (brā'kē-əl)adj. Relating to the arm.
postbrachial post·bra·chi·al (pōst-brā'kē-əl, -brāk'ē-)adj. On or in the posterior part of the upper arm.
Relating to or involving the arm.
Relating to the forelimb or wing of a vertebrate.