Medical Dictionary
stimulus
noun stim·u·lus \ˈstim-yə-ləs\
plural stim·u·li \-ˌlī, -ˌlē\
Medical Definition of STIMULUS
1
: stimulant 1
2
: an agent (as an environmental change) that directly influences the activity of living protoplasm (as by exciting a sensory organ or evoking muscular contraction or glandular secretion) <a visual stimulus>
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