atrium

Medical Dictionary

atrium a·tri·um (ā'trē-əm)
n. pl. a·tri·ums or a·tri·a (ā'trē-ə)

  1. A chamber or cavity to which several chambers or passageways are connected.

  2. Either the right or the left upper chamber of the heart that receives blood from the veins and forces it into a ventricle.

  3. That part of the tympanic cavity that lies below the eardrum.

  4. A subdivision of the alveolar duct in the lung from which the alveolar sacs open.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
Explore Dictionary.com
Previous Definition: atrioventricular-node
Next Definition: atrophedema
Words Near: atrium
More from Thesaurus.com
Synonyms and Antonyms for atrium
More from Reference.com
Search for articles containing atrium
More from Dictionary.com Translator
Dictionary.com Word FAQs

Dictionary.com presents 366 FAQs, incorporating some of the frequently asked questions from the past with newer queries.

Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature