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Definition of: ATRIUM
- (n.) A square hall lighted from above, into which rooms open at one or more levels.
- (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.
- (n.) The main part of either auricle of the heart as distinct from the auricular appendix. Also, the whole articular portion of the heart.
- (n.) A cavity in ascidians into which the intestine and generative ducts open, and which also receives the water from the gills. See Ascidioidea.