Dictionary.com
definitions

myocardosis

[mī′ō-kär-dō′sĭs]
n.
  1. Symptomatic signs of cardiac disease without any discoverable pathological lesion.
  2. Any of various degenerative conditions of the heart muscle, except myofibrosis.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.