heáh-seld
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.
heáh-seld
Add: [seld = setl, Sievers, Gram. 196, 2] I. a throne Satanus wolde on heofonum héhseld wyrcan (cf. hú hé him stólgeworhte on heofonum, Gen. 273), Sat. 372. Stondað hæleð ymb héhseld, 47. II. an elevated platform For heáhseldum pro rostris, An. Ox. 2322. Héhseldum, Wrt. Voc. ii. 68, 47. v. heáh-setl.
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A Combined List of Abbreviations.

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A Combined List of Abbreviations.