κνησμός
From LSJ
ἐξ ὀνύχων λέοντα τεκμαίρεσθαι → judge by the claws, judge by a slight but characteristic mark, small traits give the clue to the character of a person, deduce something from a small indication, identify a lion from its claws
English (LSJ)
ὁ,
A = κνῆσις, itching, Hp.VM 16, Arist.HA578b3; ἡ ἀκαλήφη κ. ποιεῖ Diph.Siph. ap. Ath.3.90a; scratching, Plu.2.126b (pl.); in a pleasurable sense, titillation, Arist. GA723b34, Pr.878b7. 2 metaph., irritation, Plu.2.61a.