Sentence:  So the Nightingale pressed closer against the thorn, and the thorn touched her heart, and a fierce <WSD>pang</WSD> of pain shot through her. Bitter, bitter was the pain, and wilder and wilder grew her song, for she sang of the Love that is perfected by Death, of the Love that dies not in the tomb. 
Meaning of the word marked with <WSD> tags:  A paroxysm of extreme physical pain or anguish; a feeling of sudden and transitory agony; a throe.