Definition of "cardiac muscle" [cardiac muscle]

• The specialized striated muscle tissue of the heart; the myocardium. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "It gave them echocardiograms and tested their blood for troponin, which is a protein found in cardiac muscle cells and is an indication of cardiovascular problems."