drǽdan
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.
drǽdan
AddGong út sáwl, hwæt drǽdest (ondrǽdest, Mart. H. 194, 4) ðú ðé?, Shrn. 141, 29. Mann wís on eallum drǽtt homo sapiens in omnibus metuit, Scint. 67, 1. & wolde hine ofsleán & dreórd him folc et volens illum occidere timuit populum, Mt. R. 14, 5. Þá leorneras wundradun & dreórdun discipuli mirabantur, 19, 25. & soecende hiá hine genóman & dreórdun him mængu et quaerentes eum tenere timuerunt turbas, 21, 46. [Perhaps in the last three examples the symbol & may represent the prefix in ondrǽdan, under which verb they would then belong.]
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A Combined List of Abbreviations.

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A Combined List of Abbreviations.