gum-cynn
This might be just a supplemental entry substituting part of 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.
gum-cynn
Substitute: I. mankind Gumcynnes gehwone (cf. moncynnes gehwone, Cri. 1027), B. 2765. Hé þæt wera cneórissum gewrecan þóhte, forgrípan gumcynne, Gen. 1275. II. a (noble) race, family, tribe, people (cf. Idisí. . . gumkunnies wíf, Mariun munilíka, Hél. 5785) Eom ic gumcynnes ánga ofer eorðan I am the only one of the race (cf. his sunu . . . , ángan ofer eorðan yrfeláfe his only son and heir, Isaac, Exod. 403), Rä. 85, 12. Wé synt gumcynnes Geáta leóde we are of the noble race of the Greats, B. 260. Swá hwylc mægða swá þone magan (Beowulf) cende æfter gumcynnum, 944.
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A Combined List of Abbreviations.