Definitions for: Atrium

[n] the central area in a building; open to the sky
[n] any chamber that is connected to other chambers or passageways (especially one of the two upper chambers of the heart)

Webster (1913) Definition: A"tri*um, n.; pl. Atria. [L., the fore court of a
Roman house.]
1. (Arch.)
(a) A square hall lighted from above, into which rooms
open at one or more levels.
(b) 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.

2. (Anat.) The main part of either auricle of the heart as
distinct from the auricular appendix. Also, the whole
articular portion of the heart.

3. (Zo["o]l.) A cavity in ascidians into which the intestine
and generative ducts open, and which also receives the
water from the gills. See Ascidioidea.

See Also: atrium cordis, atrium of the heart, chamber, court, courtyard

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