Definition of atrium Atrium

/ejˈtɹiʌm/ - [eytreeum] - a•tri•um

We found 15 definitions of atrium from 6 different sources.

What does atrium mean?

Noun Plural: atriums
atrium - any chamber that is connected to other chambers or passageways (especially one of the two upper chambers of the heart)
		chamber a natural or artificial enclosed space
atrium - the central area in a building; open to the sky

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atrium (Noun)
A central room or space in ancient Roman homes, open to the sky in the middle; a similar space in other buildings.
atrium (Noun)
A square hall lit by daylight from above, into which rooms open at one or more levels.
atrium (Noun)
Any enclosed body cavity or chamber.
atrium (Noun)
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.
atrium (Noun)
A microscopic air sac within a pulmonary alveolus.
atrium (Noun)
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.

atrium (n.)
A square hall lighted from above, into which rooms open at one or more levels.
atrium (n.)
An open court with a porch or gallery around three or more sides; especially at the entrance of a basilica or other church. The name was extended in the Middle Ages to the open churchyard or cemetery.
atrium (n.)
The main part of either auricle of the heart as distinct from the auricular appendix. Also, the whole articular portion of the heart.
atrium (n.)
A cavity in ascidians into which the intestine and generative ducts open, and which also receives the water from the gills. See Ascidioidea.

atrium
In many animals, among which the mammals, heart cavity preceding, in the blood circulation, a more muscular ventricle.

atrium
ā′tri-um, n. the entrance-hall or chief apartment of a Roman house. [Prob. orig. the kitchen, and so lit. 'the apartment blackened with smoke'—L. ater, black; others connect the word with ædes, orig. a fireplace, then a house, a temple.]