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Found 2 definitions 

  1.                 From Japanese-English FreeDict Dictionary ver. 0.1:
                

    
                
                  
     [ichi1]  [news1]  [nf07]  糸,  [ichi1]  [news1]  [nf07] いと
(noun (common) (futsuumeishi))
 (noun, used as a suffix)
thread, yarn, string

    
                
              
  2.                 From Japanese-English FreeDict Dictionary ver. 0.1:
                

    
                
                  
    糸, し
1. (noun (common) (futsuumeishi))
thread
2. (numeric)
0.001, one ten-thousandth