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WordReference Random House Learner's Dictionary of American English © 2024a•tri•um /ˈeɪtriəm/USA pronunciation n. [countable], pl. a•tri•a /ˈeɪtriə/USA pronunciation a•tri•ums. - Architecture
- a central courtyard open to the sky, or a lobby with a skylight.
- the main or central room of an ancient Roman house, open to the sky at the center.
- Anatomya hollow space in the body, esp. one of the two upper chambers of the heart.
a•tri•al, adj. WordReference Random House Unabridged Dictionary of American English © 2024a•tri•um (ā′trē əm),USA pronunciation n., pl. a•tri•a (ā′trē ə),USA pronunciation a•tri•ums. - Architecture
- Also called cavaedium. the main or central room of an ancient Roman house, open to the sky at the center and usually having a pool for the collection of rain water.
- a courtyard, flanked or surrounded by porticoes, in front of an early or medieval Christian church. See diag. under basilica.
- a skylit central court in a contemporary building or house.
- Anatomyeither of the two upper chambers on each side of the heart that receive blood from the veins and in turn force it into the ventricles. See illus. under heart.
- Neo-Latin)
- Latin (in anatomical sense
- 1570–80
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