throbbing throbbing /ˈθrɑːbɪŋ/

adjective

1. () Pounding or beating strongly or violently  ( throbbing )
   pounding or beating strongly or violently
    A throbbing pain
   a throbbing pain
    The throbbing engine of the boat
   the throbbing engine of the boat
   

noun

1. () An instance of rapid strong pulsation (of the heart)  ( throb , pounding , throbbing )
   an instance of rapid strong pulsation (of the heart)
    He felt a throbbing in his head
   he felt a throbbing in his head
   
2. A sound with a strong rhythmic beat  ( throbbing )
   a sound with a strong rhythmic beat
    The throbbing of the engines
   the throbbing of the engines
   

 throb throb /ˈθrɑːb/

noun

1. An instance of rapid strong pulsation (of the heart)  ( throb , pounding , throbbing )
   an instance of rapid strong pulsation (of the heart)
    He felt a throbbing in his head
   he felt a throbbing in his head
   
2. A deep pulsating type of pain  ( throb )
   a deep pulsating type of pain
   

verb

1. () Expand and contract rhythmically; beat rhythmically  ( pulsate , pulse , throb )
   expand and contract rhythmically; beat rhythmically
    The baby's heart was pulsating again after the surgeon massaged it
   The baby's heart was pulsating again after the surgeon massaged it
   
2. () Pulsate or pound with abnormal force  ( throb )
   pulsate or pound with abnormal force
    My head is throbbing
   my head is throbbing
    Her heart was throbbing
   Her heart was throbbing
   
3. Tremble convulsively, as from fear or excitement  ( thrill , throb , shudder , shiver )
   tremble convulsively, as from fear or excitement