nume-stán
This might be just a supplemental entry adding to an entry in the Main Volume.
In the OE text, the length is:indicated by acute accentsindicated by macronsnot indicated.
nume-stán
Add: Cf. Calc calculus, Wrt. Voc. ii. 102, 39: calculus, ratio, vel sententia, vel numerus teblstán, 43. The gloss at 13, 6 seems to combine these two, and in this case nume-stán corresponds to the second. Could nume-stán be a mistake for nume[rus tæfl]stán ?
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A Combined List of Abbreviations.

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A Combined List of Abbreviations.