Hypertext Webster Gateway: "atrium"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Atonement \A*tone"ment\, n.
{Day of Atonement} (Jewish Antiq.), the only fast day of the
Mosaic ritual, celebrated on the tenth day of the seventh
month (Tisri), according to the rites described in
Leviticus xvi. Atrium \A"tri*um\, n. (Anat.)
A cavity, entrance, or passage; as, the atrium, or atrial
cavity, in the body wall of the amphioxus; an atrium of the
infundibula of the lungs, etc.
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Atrium \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}.
From WordNet (r) 1.7 (wn)
atrium
n 1: any chamber that is connected to other chambers or
passageways (especially one of the two upper chambers of
the heart)
2: the central area in a building; open to the sky
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