occasionally To stimulate (in a physical sense).

Physiology. To act as a stimulus to (see stimulus, n. 1 3). To excite (an organ) to increased activity, to quicken the action or function of. Also…

Physiology and Biology. To excite (an organ of an animal or plant) to some characteristic action or condition, as motion, contraction, or nervous…

transitive. To excite or stimulate again.

To affect by a stimulus (bodily organs or tissues), so as to produce or intensify their characteristic activity.