þeón
This might be just a supplemental entry adding to an entry in the Main Volume.
Related §§ in Wright's OE Grammar:
§5,
In the OE text, the length is:indicated by acute accentsindicated by macronsnot indicated.
þeón
On p. 1052,; l. 33, for 20 l. 16. I. 1. add Hí forð fremedon and þungon (profecerunt ) þurh þá wununge heora geférscipes. Gr. D. 205, 5. Þonon hé forð þeón sceolde unde proficsre debuit, 200, 11. (l a) in greeting :-- Fæder mín leófa, þeóh þú an Críste wel (beneualeas in Christo ), Chrd. 92, 17. 2. AddÞá þá hé geseah hine weaxan and þeón in Godes ege cum eum in timore Domini excrevisse videret, Gr. D. 225, 22. II. AddOngytest þú hú swýðe seó eádmódnys þýhð (þiéhð, v.l.) and fremað þám þe þá gódan mægnu wyrcað? perpendis quantum in exhibendis virtutibus humilitas valet ?, Gr. D. 19, 29.
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.