ache

Concise Oxford English Dictionary © 2008 Oxford University Press:
ache/eɪk/

▶noun a continuous or prolonged dull pain. ▶verb

• 1 suffer from an ache.

• 2 long for; yearn.

– derivatives
aching adjective,
achingly adverb.

– origin OE æce (n.), acan (v.); the modern spelling is due to a mistaken assumption that the word is derived from Gk akhos ‘pain’.