heard-sǽlþ
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.
heard-sǽlþ
AddSe cyning . . . him wæs wániende ǽgþer ge his ágene heardsǽlða ge ealles þæs folces rex . . . nunc suam, nunc publicam infelicitatem deflet, Ors. 4, 5 : S. 166, 20.
This is a supplementary entry with editorial changes to an entry in the main volume of the dictionary. Look under the 'Possibly connected entries' below, or for the same headword in the list to the left.

A Combined List of Abbreviations.

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A Combined List of Abbreviations.