Relating to both the arm and the spinal column or backbone, describing conditions or anatomical features involving these structures together.
From Greek 'brachion' (arm) and 'rhachis' (spine/backbone), combined with the adjectival suffix '-ian'. This highly specialized term appears in medical literature for describing complex spinal-arm relationships.
This is the kind of word that makes you realize just how specific medical terminology can get—it's used for conditions where problems in your spine affect your arm, or when doctors need to describe surgery affecting both areas at once.
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