The Collaborative International Dictionary of English v.0.48:

pang \pang\ (p[a^]ng), n. [Prob. for older prange. Cf. Prong.]
   A paroxysm of extreme pain or anguish; a sudden and
   transitory agony; a throe; as, the pangs of death.
   [1913 Webster]

   Syn: Agony; anguish; distress. See Agony.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pang \Pang\, v. t.
   To torture; to cause to have great pain or suffering; to
   torment. [R.] --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pang
    n 1: a sudden sharp feeling; "pangs of regret"; "she felt a stab
         of excitement"; "twinges of conscience" [syn: pang,
         stab, twinge]
    2: a mental pain or distress; "a pang of conscience" [syn:
       pang, sting]
    3: a sharp spasm of pain