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English definition of “atrium”

atrium

noun [C] uk   /ˈeɪ.tri.əm/ (plural atriums) us  

atrium noun [C] (ROOM)

a very large room, often with glass walls or roof, especially in the middle of a large shop or office building

atrium noun [C] (HEART)

specialized anatomy (also auricle) one of the two spaces at the top part of the heart that receive blood from the veins and push it down into the ventricles (= lower spaces)
(Definition of atrium from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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