Medical Dictionary

chalasia cha·la·sia (kə-lā'zē-ə, -zhə) or cha·la·sis (-lā'sĭs)
The inhibition and relaxation of a previously sustained contraction of a muscle or synergistic group of muscles, such as the cardiac sphincter.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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