Definition of “RA” - English Dictionary

“RA” in British English

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RAadjective

uk /ɑː ˈeɪ/ us /aːr ˈeɪ/ specialized

abbreviation for radial artery: the artery (= large blood vessel) that goes from below the elbow to the palm of the hand

RAnoun [ C ]

uk /ɑː ˈeɪ/ us /aːr ˈeɪ/ specialized

abbreviation for right atrium: the right upper chamber (= space) of the heart

(Definition of “RA” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)