hyrst
This might be just a supplemental entry adding to an entry in the Main Volume.
Related §§ in Wright's OE Grammar:
In the OE text, the length is:indicated by acute accentsindicated by macronsnot indicated.
hyrst
Add:I. a wood, copse Hec sunt pascua porcorurn . . . ilia silua sandhyrst norninatur, C. D. ii. 65, 8. II. an eminence, knoll Wermód on hyrstum heasewe standeð (cf. wermód byð cenned on dúnum and on stǽnilicum stówum, Lch. i. 216, 19) glauca absinthia campi, Rä. 41, 61. ¶ The word occurs in a great many place-names. Where the first part of the compound is the name of a tree hyrst probably belongs to I. e. g. æsc-, hæsel-, hnut-, holen-, mapolder-, seal-, þorn-hyrst. So, too, perhaps in earnes, úlan hyrst. But in some others itt [v. N. B. D. hurst.]
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A Combined List of Abbreviations.

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A Combined List of Abbreviations.