mǽþ
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.
mǽþ
mowing. AddSe Godes þeówa cwæð: 'Árís and ber þis gréne híg þám horsum . . . nú is lytel tó láfe þysses mǽþes (cf. hé máweþ heig on þissere dene, 2), and swá þis gedón byþ, ic gá æfter þá' leva fenum viride, porta pabulum jumentis; ecce ego, quia parum superest, opere expleto te subsequor, Gr. D. 36, 31. v. mǽþ-méd ; máwan.
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A Combined List of Abbreviations.

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A Combined List of Abbreviations.