" common divisor "

[Noun]  | "common divisor" 

1: a number or expression that divides two or more numbers or expressions without remainder —called also common factor

Origin: 1557 ;

[Noun]  | "greatest common divisor" 

1: the largest integer or the polynomial of highest degree that is an exact divisor of each of two or more integers or polynomials —called also greatest common factor

Origin: 1660 ;