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(anatomy) 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.
(anatomy) A microscopic air sac within a pulmonary alveolus.
(palynology) 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.
1965, Janet Kircher Warter, Palynology of a Lignite of Lower Eocene (Wilcox) Age from Kemper County, page 52:
Nexine 0.5μ thick, separating from the sexine about 5μ from the pore and forming a deep, well-defined atrium.
“atrium”, in Kielitoimiston sanakirja [Dictionary of Contemporary Finnish] (in Finnish) (online dictionary, continuously updated), Kotimaisten kielten keskuksen verkkojulkaisuja 35, Helsinki: Kotimaisten kielten tutkimuskeskus (Institute for the Languages of Finland), 2004–, retrieved 2023-07-02
An outcry goes up to the height of the halls. (Translations vary – Mackail, 1885: “the high halls”; Knight, 1956: “the palace-roof”; Fitzgerald, 1981: “the high chambers”; West, 1990: “the high walls of the palace”; Ahl, 2007: “high through the courtyard’s open roof”; Ruden, 2021: “to the rooftop”.)
“ātrĭum”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
“atrium”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
atrium in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)