on-íwan
This might be just a supplemental entry adding to an entry in the Main Volume.
In the OE text, the length is:indicated by acute accentsindicated by macronsnot indicated.
on-íwan
Add:I. to show Ðá seó sunne begann onýwan eallum mannum hire ðone beorhtan leóman, Hml. S. 23, 263. II. reflex, with complement, to appear so and so Ne sceall ic nǽfre læng unþancfull þǽre þegnunge mé onýwan þám were viro illi qui mihi solet obsequi ingratus apparere non debeo, Gr. D. 343, 12.
This is a supplementary entry with editorial changes to an entry in the main volume of the dictionary. Look under the 'Possibly connected entries' below, or for the same headword in the list to the left.

A Combined List of Abbreviations.

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A Combined List of Abbreviations.