dæg
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.
dæg
. I a. add: ¶ in pl. days, denoting a period of undefined extent On þám dagum cóm Ióhannes, Mt. 3, 1: Lk. 1, 39. II. AddGeloten dæg suprema (dies ), Wrt. Voc. i. 53, 14. III.AddÞú sealdest him langsumnyssa dagena, Ps. L. 20, 5. 2. ¶ Árísed óðer cynning ... feá tíde hé bið on his dagum exsurget alius rex ... paucum tempus sub cuius diebus, Verc. Först. 104, 4. v. Candelmæsse-dæg, fæsten-dæg, foran-dæg, gearcung-dæg, gegearcung-dæg, geohhol-dæg, hálig-dæg, heáhmæsse-dæg, heófung-dæg, hláfmæsse-dæg, lencten-dæg, mæsse-dæg, mál-dæg, merigen-dæg, middel-dæg, midne-dæg, morgen-dæg, Sunnan-dæg, Wódnes-dæg; dœ́g.
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A Combined List of Abbreviations.

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A Combined List of Abbreviations.