Evidently quoted from somewhere, this headword -- nominative/accusative neuter singular or masculine accusative singular of the adjective χλιδανός (cognate with chi 340, q.v.) -- is similarly glossed in other lexica; see Etymologicum Genuinum, Etymologicum Magnum 812.34, Hesychius.
For the word itself, with early attestations in lyric poetry (Sappho fr.60 Lobel-Page) and tragedy (Aeschylus, Persae 544), see LSJ s.v.