niþer
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.
niþer
AddÐonne sió lufu for mildheortnesse nieðer ástígeð, Past. 103, 16. wæter ic niðer (not neðer, v. Angl. i. 509) ágeát aquam effudi, Nar. 8, 10. Betwix deádum mannum bið þín earding-stów niðer on eorðan, 50, 28. Wearþ hine niðer on þæt nióbedd, Gen. 343. Niðer under næssas, Sat. 31. Sé sceal heán wesan niðer gebíged, Mód. 55. Funde þreó róda under neólum niðer næsse gehýdde, El. 832. v. niþere.
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A Combined List of Abbreviations.

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A Combined List of Abbreviations.