a cramp or muscular spasm caused by loss of water and salt following prolonged exertion in hot weather.
Origin of heat cramp
First recorded in 1935–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Painful muscle spasms following hard work in intense heat, caused by loss of salt and water from profuse sweating.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.