throbbing

Noun	1.	throbbing - an instance of rapid strong pulsation (of the heart); "he felt a throbbing in his head" Synonyms: pounding, throb
	2.	throbbing - a sound with a strong rhythmic beat; "the throbbing of the engines"
Adj.	1.	throbbing - pounding or beating strongly or violently; "a throbbing pain"; "the throbbing engine of the boat"

rhythmic, rhythmical