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''atrium'' ▫ᴱᴺ Entries

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''atrium'' ▫ᴱᴺ｜Definition｜1st｜20260331180822-00-⌔

atrium - Wiktionary, the free dictionary

English

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Noun

atrium (plural atria or atriums)

  • (architecture) A central room or space in ancient Roman homes, open to the sky in the middle; a similar space in other buildings.
  • (architecture) A square hall lit by daylight from above, into which rooms open at one or more levels.
  • (anatomy) A cavity, entrance, or passage.
    • ✤ an atrium of the infundibula of the lungs
  • (biology) Any enclosed body cavity or chamber.
  • (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.
    • ✤ Nexine 0.5μ thick, separating from the sexine about 5μ from the pore and forming a deep, well-defined atrium.1

Etymology

From Latin ātrium (“entry hall”), from Etruscan.

Pronunciation

  • IPA: /ˈeɪ.tɹi.əm/
  • Audio (Southern England): 🔊
  • Hyphenation: a‧tri‧um

Printed 2026-06-28.

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Footnotes

  1. 1965, Janet Kircher Warter, Palynology of a Lignite of Lower Eocene (Wilcox) Age from Kemper County ‎, page 52: ↩

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Secondary

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