Same or similar entry in other lexica. The headword phrase (which must be quoted from somewhere) combines the perfect participle of bai/nw with the adverb eu)=. It is either neuter nominative/accusative plural or masculine accusative singular; and the latter is the more likely, given the instances of this phrase attaching to nous in (e.g.) Justinian and, especially Cyril of Alexandria.
For the glossing term see epsilon 3745.
cf. generally beta 219.