ge-síman
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.
ge-síman
Take here ge-sýman in Dict., and add Gýmena hefum hé bið gesýmed (adgrauatur), Scint. 181, 17. Se sceaða wæs on róde scyldig and mánfull, mid undǽdum eall gesýmed, Dóm. L. 58. Ge-sýmedum (-sém-, Hpt. Gl. 468, 26) honustis, An. Ox. 2644.
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A Combined List of Abbreviations.

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A Combined List of Abbreviations.