1. The occasional tendency of two diseases to coalesce into one.
  2. The psychological state of wholesome association with others.
  3. A number of similar structures inclined in one general direction, such as the ribs.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.