Entry in two manuscripts only (IM), Adler reports.
The unglossed headword, otherwise attested only in the 10th century Life of St. Nicephoros of Miletus, would seem to be masculine/feminine accusative singular or neuter nominative/accusative plural of an adjective e)gkrufh/s (not registered by LSJ), a variant of e)/gkrufos (also very rare).
For the etymology cf. generally kappa 2505, kappa 2507; and note also epsilon 131.