This might be just a supplemental entry adding to an entry in the Main Volume.
Related §§ in Wright's OE Grammar:
§5,
In the OE text, the length is:indicated by acute accentsindicated by macronsnot indicated.
AddCuu vacca, Wrt. Voc. ii. 123, 16. Ealdre cú meolc, Ll. Th. i. 438, 18. Æt ánes heówe[s] cý, Lch. iii. 24, 13. Hé ðá cealfas tó cúum lǽdde, Shrn. 61, 19. Betwih cýe inter vaccas, Ps. Srt, 67, 31.
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