| Pronunciation: | | 'eytreeum
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 WordNet Dictionary |
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- [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)
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| | See Also: | | atrium cordis, atrium of the heart, chamber, court, courtyard |
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| Webster's 1913 Dictionary |
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| | 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}.
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| Medical Dictionary |
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| | Definition: | | one of two upper chambers in the heart. |
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| Biology Dictionary |
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- This is upper chamber on either side of the heart. (In humans and other mammals, there are four heart chambers: two atria and two ventricles.)
- One of two chambers in the upper part of the heart which receives blood from another part of the body and pumps it into a ventricle (another part of the heart).
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