1. 
   Asperities
   • (pl. ) of Asperity
   Found op http://thinkexist.com/dictionary/meaning/asperities/
   
   
2. 
   asperities
   asperities 1. Harshness of manner. 2. Something hard, or difficult, to endure.
   Found op http://www.wordinfo.info/words/index/info/view_unit/3695/
   
   
3. 
   Asperities
   (fault) Roughness on the fault surface posing local resistance to slip.
   Found op http://earthquakescanada.nrcan.gc.ca/info-gen/glossa-eng.php
   
   

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