farther
1. far.ther \'fa:r-th*r\ av [ME ferther, alter. of further] 1: at or to a
greater distance or more advanced point 2: more completely
2. farther aj 1: more distant : REMOTER 2: FURTHER FARTHER implies greater
distance from a point in space or less often in time, and FURTHER applies
to advance not only in space or time but also in degree or in quantity
{move out farther from the city; no further discussion is needed} SYN syn
FARTHER, FURTHER are often used interchangeably, but
Webster's English Dictionary