Medical Definition of tickle
tick·led; tick·ling \-(ə-)liŋ\play
intransitive verb: to have a tingling or prickling sensation <my back tickles>
2: to excite the surface nerves to prickle
transitive verb: to touch (as a body part) lightly so as to excite the surface nerves and cause uneasiness, laughter, or spasmodic movements
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