fyrst
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.
fyrst
adj. For 'First . . . Exod. 399' substitute: 1. first, foremost in position Hé wæs mid þǽm fyrstum mannum on þǽm lande he was among the first men in the country, Ors. 1, 1; S. 18, 13. 2. foremost in virtue or worth, best, of great excellence Hú se láreów sceal beón on his weorcum fyrest (praecipuus). Se láreów sceal beón on his weorcum heálic (praecipuus ), Past. 80, 1. Tó þám meðelstede gelǽdde Abraham Isaac . . ., fyrst ferhðbana; nó þý fæg[en]ra wæs, wolde líge gesyllan beorna sélost his swǽsne sunu tó sigetibre to the meeting-place led Abraham Isaac . . ., noble destroyer of life; not the more joyous was he (i. e. he was sorely troubled), to the flames would the best of men give his dear son as a sacrifice, Exod. 399.
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A Combined List of Abbreviations.