The Collaborative International Dictionary of English v.0.48:

Further \Fur"ther\, adv. [A comparative of forth; OE. further,
   forther, AS. fur?or, far?ur; akin to G. f["u]rder. See
   Forth, adv.]
   To a greater distance; in addition; moreover. See Farther.
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         Carries us, I know not how much further, into familiar
         company.                                 --M. Arnold.
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         They sdvanced us far as Eleusis and Thria; but no
         further.                                 --Jowett
                                                  (Thucyd. ).
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   Further off, not so near; apart by a greater distance.
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