Word.ws English Dictionary

Plural of atrium

irregular plural

The plural of atrium is atria or atriums.

Forms of atrium

Singularatrium /ˈeɪ.tɹi.əm/
Pluralatria
atriums
Countablecountable

Atria and atriums in a sentence

  • With atrial tachycardia, the atria of the heart beats abnormally fast.2013, “Therapies and Treatments”, in Q. Ashton Acton, editor, Tachycardia: New Insights for the Healthcare Professional, Atlanta, Ga.…. From the entry tachycardia
  • It protects against direct sunlight, something difficult with atria.2002, Andreas K. Athienitis, Thermal Analysis and Design of Passive Solar Buildings. From the entry anidolic
  • In mature Arion the atrium is divided into upper and lower atria, with the oviduct, spermatheca duct and epiphallus opening into the upper atrium.2012, A. South, Terrestrial Slugs: Biology, ecology and control, page 110. From the entry epiphallus
  • The heart strings keep the AV flaps pointing in the direction of the blood flow, stopping them being turned "inside out" and forced through the atria.2005, “Section 2: Heart”, in The Facts on File Illustrated Guide to the Human Body: Heart and Circulatory System, New York, N.Y.: Facts on…. From the entry heartstrings

Meaning of atrium

  1. noun A central room or space in ancient Roman homes, open to the sky in the middle; a similar space in other buildings.
  2. noun A square hall lit by daylight from above, into which rooms open at one or more levels.
  3. noun A cavity, entrance, or passage.

Full definition of atrium

Nouns ending in -um: plural -a

Questions about the plural of atrium

What is the plural of atrium?
The plural of atrium is atria or atriums.
Which is correct, atria or atriums?
Both are used. atria is the more common of the two in English writing.
Is atrium countable?
Atrium is a countable noun.

Source and license

Adapted from Wiktionary: atrium (page history and authors) and the entries of its forms. Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws left out forms marked obsolete, archaic, rare or dialectal and added the examples. Wiktionary data of 2026-09-02.

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