The headword is aorist active participle, masculine nominative singular, of e)ndi/dwmi; cf. epsilon 1184. It must be quoted from somewhere, but is far too commonplace to track down. (For the general sense see LSJ s.v. e)ndi/dwmi, V.3.)
The headword has this same gloss in Lexica Segueriana 220.19 (and again in ps.-Zonaras). The participle a)raiw/sas is otherwise unattested except for one instance in the 13th-century Byzantine historian Ducas.