þeódan
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.
þeódan
Add: to join as a companion, associate with, attach oneself to a person, society, place, &c. Sege úrum bróþrum heora nǽnig hine ne þýde tó þám seócan bréþer nullus ex fratribus se ad eum morientem jungat, Gr. D. 344, 27. Utan þýdan ús tó þám úplican ríce, Verc. Först. 112, 10. v. under-þeód.
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A Combined List of Abbreviations.

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A Combined List of Abbreviations.