rǽdere
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.
rǽdere
I. AddRǽdere geornfull má tó gefyllenne þe hé rǽd þænne tó witenne hræd ys lector strenuus potius ad complendum quę legit quam ad sciendum promptus est, Scint. 219, 16. v. mete-, pistol-rǽdere.
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.