The headword is the aorist active participle, (masculine) genitive plural, of ka/mnw. This verb has a wide range of meanings -- 'work hard', 'suffer', 'get tired', 'get sick' (cf. kappa 286) -- but the aorist participle is commonly used as a euphemism for 'having died'.
The headword might be extracted from the quotation given here, but more probably from the formulaic phrase ei)/dwla kamo/ntwn in Homer (Iliad 23.72, Odyssey 11.276, 24.14), of which the current quotation is a reminiscence; cf. scholia ad locc., Etymologicum Magnum 102.50, 488.25; Lexicon Vindobonense kappa56; and kappa 286.
[1] Greek Anthology 7.68.3-4 (Archias); see also the LSJ entry for ei)/dwlon for 'ghosts' (web address 1). On this epigram, wherein the philosopher Diogenes the Cynic, bound for Hades, addresses Charon [Author, Myth] (q.v. chi 135), see Gow and Page (vol. I, 408-409) and (vol. II, 441). On Diogenes, see delta 1141, delta 1143, and delta 1144.