Dictionary.com
definitions

cor triloculare

[trī-lŏk′yə-lâr′ē]
n.
  1. A congenital heart abnormality in which the heart has three chambers due to the absence of the interatrial or interventricular septum.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.