heals-fæst
This might be just a supplemental entry substituting part of an entry in the Main Volume.
In the OE text, the length is:indicated by acute accentsindicated by macronsnot indicated.
heals-fæst
Substitute: With unbending neck, defiant, unsubmissive, proud, contemptuous Hire (Hagar) mód ástáh þá heó wæs magotimbre eácen worden, ongan æfþancum ágendfreán halsfæst herian (cf. Agar concepisse se videns despexit dominam suam, Gen. 16, 4), Gen. 2238.
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.