langsum
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.
langsum
Add:I. in reference to time. 1. of a space of time, long Seó eorþe byð mid þám winterlican cyle þurhgán, and byð langsum ǽr ðám ðe heó eft gebeðod sý, Lch. iii. 252, 7. Langsumum fæce prolixa (i. longo) (temporum) intercapedine (i. spatio ), An. Ox. 3625. 2. of action that goes on long, or state or thing that lasts long Langsum diuturnum (trophaeum ), An. Ox. 800. Langfére, langsum diuturna i. longeua (valetudo ), 2072. Mid langsumere gestra[n]gunge diuturna uegetatione , 1444. Hé gebád langsumne hiht, Exod. 405: Gen. 1757: B. 1722. Ðæt hió hiom líf mid ðé langsum begéton, Ps. C. 57. (2 a) where the time seems too long. α. prolix, tedious, wearisome Lagu byð leódum langsum geþúht, gif hí sǽýða swíðe brégað, Rún. 21. Nán mann on lífe on ðyssere langsuman worulde, Hex. 2, 11. For langsumere prolixa (valetudine fatigatam ), An. Ox. 3997. β. dilatory, tardy Hwæt sceall hit swá langsum, efne nú is se tíma, Hml. S. 22, 212. II. of space relations, lengthy, extended Langsum[um] wrǽda bíum prolixis fasciarum ambagibus , An. Ox. 3498. III. of a person, patient, long-suffering; longanimis, Ps. Spl. 102, 8: Wrt. Voc. ii. 53, 52 (in Dict.).
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.