myrre
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.
myrre
Add eallum uncystum þe on gómum beóð ácenned . . . myrre and pipor, Lch. i. 318, 14. Tó gehealdanne líchoman hǽlo mid Drihtnes gebede, þis is aeþele lǽcedóm. Genim myrran and gegníd on wín . . . Þonne is eft se æþelesta lǽcedóm tó þon ilcan. Genim myrran and hwít récels . . . and þæs récelses and myrran sý mǽst, ii. 294, 17-25. [From Latin.]
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A Combined List of Abbreviations.

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A Combined List of Abbreviations.