What does atria mean?
Atria is the plural of atrium, a Latin word that has entered English through both anatomy and architecture. In medicine, the atria are the heart's two upper chambers, which receive incoming blood — one from the body via the venae cavae, the other from the lungs via the pulmonary veins — before passing it to the lower ventricles. In architecture, atria denote grand, open central spaces in buildings, typically rising through several stories beneath a glazed or skylit roof, a feature popularized by Roman house design and revived in modern hotels, museums, and office towers. Because it is a plural, atria takes plural verbs, though the anglicized alternative 'atriums' appears informally, particularly for buildings. The word carries a tone of technical precision in cardiology and of spacious elegance in architectural writing, making it useful in scientific, journalistic, and design contexts alike.
The two upper chambers of the heart, which receive blood from the veins.
"The right and left atria contract just before the ventricles do."
Plural of atrium: large open central spaces in buildings, often topped by skylights.
"Visitors gathered beneath the vast atria of the convention center."
Use with plural verbs: 'the atria are'. The Latin plural is standard in medical writing; 'atriums' occasionally appears for architectural senses.
"Both atria were dilated on the echocardiogram."
Your heart's atria are named after the entrance halls of ancient Roman houses — the rooms where guests were received.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of atria
Atria derives directly from the Latin 'atrium', the term for the central hall or main reception room of an ancient Roman house, often open to the sky at its center. The anatomical sense arose because the heart's upper chambers were likened to these entry chambers through which blood first enters. English adopted the word in the early modern period, and the Latin plural 'atria' came to be preferred over anglicized forms, especially in medical usage.
How atria is actually used
Strictly a plural form; 'atria' should be paired with plural verbs ('the atria are'). Some writers use 'atriums' as an anglicized plural, but 'atria' remains standard, especially in medical contexts.
Easily confused with atria
Atrium is singular while atria is its plural form.