noun Physiology.
the minimum electric current required to excite a given nerve or muscle.

1920–25; rheo- + base1

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World English Dictionary
rheobase (ˈriːəʊˌbeɪs)
physiol the minimum nerve impulse required to elicit a response from a tissue

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

rheobase rhe·o·base (rē'ō-bās')
The minimal strength of an electrical stimulus that is able to cause excitation of a tissue.

rhe'o·ba'sic adj.
The American Heritage® Stedman's Medical Dictionary
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