Meanings
nounleft atrium (plural left atriums or left atria)
plural left atriums · plural left atria
- anatomyOne of the chambers of the heart in humans and other mammals, which receives oxygenated blood from the lungs via the pulmonary veins, and pumps it into the left ventricle.
Synonyms & antonyms
nounthe left upper chamber of the heart that receives blood from the pulmonary veins
Similar
left atrium of the heartatrium sinistrum
Broader
atrium cordisatrium of the heart
Synonym sets from Open English WordNet, CC BY 4.0.
Cite this entry
APA
left atrium. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/left%20atrium
MLA
“left atrium.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/left%20atrium. Accessed November 3, 2026.
Chicago
WatkinsX Dictionary, s.v. “left atrium,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/left%20atrium.
Source: left atrium on Wiktionary, CC BY-SA 4.0.