threshold

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threshold renal threshold

Main Entry: thresh·old
Pronunciation: thresh-(h)ld
Function: noun
: the point at which a physiological or psychological effect begins to be produced (as the degree of stimulation of a nerve which just produces a response or the concentration of sugar in the blood at which sugar just begins to pass the barrier of the kidneys and enter the urine) <below the threshold of consciousness> <the threshold of pain> <a high renal clearance threshold> -- called also limen