DuckCorp Dico

Found one definition

1.                 From en.wiktionary.org:
                   
   
   
                   
                     
   
   ** English
   
   *** Noun
   [en-noun]
   
    1. [en]  A bolt  with a head  on one end and a thread  on the other end, to be screw ed into some fixed part, instead of passing through the part and receiving a nut .
    2. [en]  [en]  A self-tapping  bolt.