ebba
This might be just a supplemental entry adding to an entry in the Main Volume.
Related §§ in Wright's OE Grammar:
In the OE text, the length is:indicated by acute accentsindicated by macronsnot indicated.
ebba
AddOn þís ylcan geáre wæs swa mycel ebba ǽghwǽr ánes dæges swá nán man ǽror gemunde, and swá man férde rídende and gangende ofer Tæmese be-eástan þǽre brigge on Lunden, Chr. 1114; P. 244, 13. iii. ebban týne he must put three fences to correspond to the heights of spring, middle and neap tides (v. Seebohm Vill. Comm. p. 155), C. D. iii. 451, 2.
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A Combined List of Abbreviations.

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A Combined List of Abbreviations.