1. 
   Heartstring
   Heart'string` (-strĭng`) noun A nerve or tendon, supposed to brace and sustain the heart. Shak. « Sobbing, as if a heartstring broke.» Moore.
   Found op http://www.encyclo.co.uk/webster/H/23
   
   
2. 
   heartstring
   A nerve or tendon, supposed to brace and sustain the heart. 'Sobbing, as if a hearstring broke.' (Moore) ... Source: Websters Dictionary ... (01 Mar 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?heartstring
   
   
3. 
   Heartstring
   • (n.) A nerve or tendon, supposed to brace and sustain the heart.
   Found op http://thinkexist.com/dictionary/meaning/heartstring/
   
   

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