threshold substance

n.

A material excreted in the urine only when its concentration in the plasma exceeds a certain value.

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Nearby words

threshing machine, threshold, threshold agreement, threshold limit value, threshold stimulus, threshold substance, threw, thrice, thrift, thriftless, thriftshop

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