palpitation (n.) Look up palpitation at Dictionary.com
early 15c., from Middle French palpitation, from Latin palpitationem (nominative palpitatio), noun of action from past participle stem of palpitare "to throb, to flutter, to tremble, to quiver," frequentative of palpare "touch gently, stroke; wheedle, coax" (see feel (v.)).