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adv. & prep. [ Cf. Along. ] Lengthwise; along. [ Archaic ] [ 1913 Webster ]

The doors were all of adamants eterne,
I-clenched overthwart and endelong
With iron tough. Chaucer. [ 1913 Webster ]

He pricketh endelong the large space. Chaucer. [ 1913 Webster ]

To thrust the raft endlong across the moat. Sir W. Scott. [ 1913 Webster ]