stód-hors
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.
stód-hors
AddHé þone cyning bæd hé him wǽpen sealde and stódhors (equum emissarium) . . . For þon þám bisceope hiora hálignesse ne wæs álýfed hé móste wǽpen wegan, ne ælcor bútan on myran rídan, Bd. 2, 13; Sch. 168, 11.
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A Combined List of Abbreviations.

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A Combined List of Abbreviations.