throb

Short definition from Wiktionary

Verb

1. 1
   To pound or beat rapidly or violently.
2. 2
   To vibrate or pulsate with a steady rhythm.
3. 3
   To pulse (often painfully) in time with the circulation of blood.
4. 4
   To exhibit an attitude, trait, or affect powerfully and profoundly.

Noun

1. 1
   A beating, vibration or palpitation.