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atrium

a·tri·um

atrium

 
pronunciation:
eI tri m
features:
Word Combinations (noun), Word Explorer
part of speech: noun
inflections: atria, atriums
definition 1: an enclosed courtyard, esp. in ancient Roman houses or early Christian churches.
definition 2: in anatomy, any internal cavity, esp. one of the two upper heart chambers.
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derivation: atrial (adj.)
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  building