\End"long`\ (?; 115), adv. & prep. [Cf. {Along}.]
Lengthwise; along. [Archaic]

      The doors were all of adamants eterne, I-clenched
      overthwart and endelong With iron tough. --Chaucer.

      He pricketh endelong the large space.    --Chaucer.

      To thrust the raft endlong across the moat. --Sir W.
                                               Scott.