Palpitate \PAL-pi-teyt\ , verb;
1. To pulsate with unusual rapidity from exertion, emotion, disease, etc.; flutter
2. To cause to pulsate or tremble
According to Etymonline.com:
Palpitate dates from the 1620's and comes from Latin palpitatus, which is the past participle of palpitare ("to throb, to flutter").
*Today's word and the first definition were both taken from Dictionary.com's 'Word of the Day' for Sunday, November 7