grǽg
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.
grǽg
AddGreig feruginius, Txts. 63, 850. Grei gillus ( = gilvus), 67, 967. Hęuui vel grei, háuui vel grei, heáuui, grei glaucum, 66, 473. Grǽg, hǽwe ísene oþþe sinderóme ferrugine (cf. ferrugine, i. ferreo colore ísengrǽg gesweorf, 31), Wrt. Voc. ii. 35, 34. Grége gós gans, 42, 15. Tó ðám grǽgan stáne, C. D. iii. 446, 8. Tó grǽwan stáne, ii. 29, 3. On grégan stán, v. 233, 2. Oþ þá grǽgan hárnesse usque cigneam canitiem, An. Ox. 1876. Nis ná Godes wunung on ðám grǽgum stánum, Hml. S. 7, 135. v. æsc-grǽg, deorce-grǽg (perhaps deorce should be taken as an independent adverb), dun-grǽg, flint-grǽg, fold-grǽg, ísen-grǽg, ísern-grǽg.
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A Combined List of Abbreviations.

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A Combined List of Abbreviations.