/stim"yeuh leuhs/ , n. , pl. stimuli /-luy'/ .
1. something that incites to action or exertion or quickens action, feeling, thought, etc.: The approval of others is a potent stimulus.
2. Physiol. , Med. something that excites an organism or part to functional activity.
[ 1605-15; ]
Syn. 1. incitement, enticement, motive, provocation. 2. stimulant.
Ant. 1. discouragement.