base of heart


The part of the heart formed mainly by the left atrium and to a lesser extent by the posterior part of the right atrium, directed backward and to the right, and separated from the vertebral column by the esophagus and aorta.

Nearby words

  1. biotic factor,
  2. biotic potential,
  3. biotin,
  4. biotinide,
  5. biotite,
  6. biotoxicology,
  7. biotoxin,
  8. biotransformation,
  9. biotron,
  10. biotroph

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.