Source : WordNet®

greatest common divisor
     n : the largest integer that divides without remainder into a
         set of integers [syn: {greatest common factor}, {highest
         common factor}]

Source : Free On-Line Dictionary of Computing

greatest common divisor
     
         (GCD) A function that returns the largest
        positive {integer} that both arguments are integer multiples
        of.
     
        See also {Euclid's Algorithm}.  Compare: {lowest common
        multiple}.
     
        (1999-11-02)