atrium

Fetched 2026-10-26 (cache).

Synonyms: natrium, arium

Antonyms: natrium, arium

Related words from Datamuse; suggestions, not definitions.

Noun

1. {{lb|en|architecture}} A central room or space in ancient [[Roman]] homes, open to the sky in the middle; a similar space in other buildings.
2. {{lb|en|architecture}} A square [[hall]] lit by daylight from above, into which rooms open at one or more [[level]]s.
3. {{lb|en|anatomy}} A [[cavity]], [[entrance]], or passage.
4. {{lb|en|biology}} Any enclosed body cavity or [[chamber]].
5. {{lb|en|anatomy}} An upper chamber of the heart that receives blood from the [[vein]]s and forces it into a [[ventricle]]. In higher [[vertebrate]]s, 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.
6. {{lb|en|anatomy}} A microscopic air sac within a pulmonary [[alveolus]].
7. {{lb|en|palynology}} A cavity inside a [[pore|porate]] aperture of a pollen grain formed by the separation of the [[sexine]] and [[nexine]] layers, widening toward the interior of the grain.

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.