relative refractory period
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Related to relative refractory period: Absolute refractory period
relative refractory period[′rel·əd·iv ri′frak·trē ‚pir·ē·əd]
A period of a few milliseconds following the absolute refractory period during which the excitation threshold of neural tissue is raised and a stronger-than-normal stimulus is required to initiate an action potential.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.