níd-þearf
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.
níd-þearf
IV. add: need, a condition marked by the lack or want of something necessary, or requiring some extraneous aid or addition Ðonne hié eallenga ágiémeleásiað ðone ymbhogan woruldcundra ðinga, ðonne gefultumað hé náwuht tó his hiéremonna niédðearfe subditorum necessitatibus minime concurrunt, Past. 137, 3.
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.