on-wacan
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-wacan
I. AddSóna swá ic anwóc, swá wilnode ic eft wínes quando evigilabo, et sursum vina reperiam, Past. 431, 17. II. AddTó þon him gewin eft þonan onwóce, Ors. 4, 13; S. 212, 18. [Onweócon in the last line is probably an error for onwócon, the e being underdotted in the MS.] v. wacan.
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A Combined List of Abbreviations.

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A Combined List of Abbreviations.