gagátes
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.
gagátes
l. gagates jet, at end for Lch. iii. l. Lch. ii., and add Hér bið geméted gagates stán; sé bið swylce blæc gim, gif mon déð on fyr, nǽdran fleógaþ áweg ðone stenc gignit lapidem gagatem; est nigrogemmeus, et ardens igni admotus incensus serpentes fugat, Bd. 1, 1; Sch. 9. 5. [v. N. E. D. gagate.]
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.