counteropening

[koun′tər-ōpə-nĭng]
n.
  1. A second opening made at the lowest part of an abscess or other fluid-containing cavity to assist in drainage.contra-aperture counterpuncture
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.