- Also called cavaedium.the main or central room of an ancient Roman house, open to the sky at the center and usually having a pool for the collection of rain water.
- a courtyard, flanked or surrounded by porticoes, in front of an early or medieval Christian church.
- a skylit central court in a contemporary building or house.
- Anatomy. either of the two upper chambers on each side of the heart that receive blood from the veins and in turn force it into the ventricles.
Origin of atrium
Examples from the Web for atrial
Historical Examples of atrial
The two atrial tubes of each zooid remain separate in front but unite posteriorly.
The atrial cavities in Pyrosoma are clearly lined by epiblast, just as in simple Ascidians.
When the young colony is ready to become free, it escapes from the atrial cavity of the parent, and increases in size by budding.
During the above described processes the test remains quite intact, and is not perforated at the oral or the atrial openings.
The oral opening into the branchial sack is directed upwards: an atrial opening is remarkably enough not present.
- the open main court of a Roman house
- a central often glass-roofed hall that extends through several storeys in a building, such as a shopping centre or hotel
- a court in front of an early Christian or medieval church, esp one flanked by colonnades
- anatomy a cavity or chamber in the body, esp the upper chamber of each half of the heart
Word Origin for atrium
1570s, from Latin atrium "central court or main room of an ancient Roman house, room which contains the hearth," sometimes said (on authority of Varro, "De Lingua Latina") to be an Etruscan word, but perhaps from PIE *ater- "fire," on notion of "place where smoke from the hearth escapes" (through a hole in the roof). Anatomical sense of "either of the upper cavities of the heart" first recorded 1870. Meaning "skylit central court in a public building" first attested 1967.
- Of or relating to an atrium.
- A chamber or cavity to which several chambers or passageways are connected.
- Either the right or the left upper chamber of the heart that receives blood from the veins and forces it into a ventricle.
- That part of the tympanic cavity that lies below the eardrum.
- A subdivision of the alveolar duct in the lung from which the alveolar sacs open.
- A chamber of the heart that receives blood from the veins and forces it by muscular contraction into a ventricle. Mammals, birds, reptiles, and amphibians have two atria; fish have one.