κῖκυς

A. strength, vigour, poet. word, οὐ γάρ οἱ ἔτ’ ἦν ἲς ἔμπεδος οὐδέ τι κ. Od. 11.393, cf. h.Ven. 237, Alc. 137 (dub.); σοὶ δ’ οὐκ ἔνεστι κ. οὐδ’ αἱμόρρυτοι φλέβες A. Fr. 230.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project