drugung
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.
drugung
l. drúgung, drúwung, and add Seó lange drúgung (drúwung, v. l.) mid mycelre hǽte bærnde þá eorðan aestu nimio terram longa siccitas exurebat, Gr. D. 210, 16. Hit wæs ǽr þǽr singal drúwung, and sóna æfter þám cóm geþuhtsum rén, Shrn. 113, 20.
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.