Entry (out of alphabetical order) lacking, Adler reports, in mss AS; added in the margin of M.
The unglossed headword is the pluperfect active indicative, third person plural, of the verb o)/mnumi, 'I swear' (LSJ entry at web address 1). It must be quoted from somewhere; extant instances begin with Xenophon, Hellenica 5.1.35. (For one in Cassius Dio, see under delta 1023.)