scǽnan
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.
scǽnan
AddGif þú ostran habban wylle, þonne clǽm þú þíne wynstran hand ðám gemete þe þú ostran on handa hæbbe, and dó mid sexe oððe mid fingre swylce þú ostran scénan wylle, Tech. ii. 124, 14.
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.

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A Combined List of Abbreviations.