An excess of muscular tension or strength.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Examples from the Web for hypersthenia
Historical Examples of hypersthenia
Steeped in superstition, hypersthenia, God to her was a man—her lover.Little Journeys to the Homes of the Great, Vol. 13