Substantiv
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| atrium -
A central room or space in ancient Roman homes, open to the sky in the middle; a similar space in other buildings.
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| atrium -
A square hall lit by daylight from above, into which rooms open at one or more levels.
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| atrium -
Any enclosed body cavity or chamber.
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| atrium -
An upper chamber of the heart that receives blood from the veins and forces it into a ventricle. In higher vertebrates, the right atrium receives blood from the superior vena cava and inferior vena cava, and the left atrium receives blood from the left and right pulmonary veins.
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| atrium -
A microscopic air sac within a pulmonary alveolus.
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| atrium -
A cavity inside a porate aperture of a pollen grain formed by the separation of the sexine and nexine layers, widening toward the interior of the grain.
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