throbbing

intransitive verb throbbed, throbbing

1. to beat, pulsate, vibrate, etc.
2. to beat strongly or fast; palpitate, as the heart under exertion
3. to feel or express emotion; quiver with excitement

Origin: ME throbben, prob. of echoic orig.

noun

1. the act of throbbing
2. a beat or pulsation, esp. a strong one of the heart