DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   pilus
       n 1: any of the cylindrical filaments characteristically growing
            from the epidermis of a mammal; "there is a hair in my
            soup" [syn: hair, pilus]
       2: hairlike structure especially on the surface of a cell or
          microorganism