tredan
This might be just a supplemental entry adding to an entry in the Main Volume.
Related §§ in Wright's OE Grammar:
In the OE text, the length is:indicated by acute accentsindicated by macronsnot indicated.
tredan
I. add: to press with the foot, hold the foot on something Hé worhte him áne anlícnesse þe ... mid ðáre swíðran hand þone hwǽte hlód, and mid þám winstran fét þá mittan træd, Ap. Th. 10, 13.
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.

Abbreviation not recognized. See:

A Combined List of Abbreviations.