wæstm
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.
wæstm
. I 2. AddHé bæd God geornlíce hé þám þegne forgeáfe bearnes wæstm, Hml. S. 33, 18. I. 6. AddSe cwide hú mon ðæt feoh befæste ðǽm ciépemen ðe hé scolde forð sellan tó wæstme. Past. 379, 8. III. AddHé wæs scort on wæstme statura pusillus erat, Hml. Th. i. 580, 30. Þá assan syndon on þám mǽstan wæstme (printed wæstene) onagri forma maxima, Nar. 34, 16. v. geár-wæstm.
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A Combined List of Abbreviations.

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A Combined List of Abbreviations.