ὕδερος
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, (ὕδωρ)
A = ὕδρωψ, dropsy, Id.Int.22, Arist. EN1150b33, etc.; ὑδέρῳ νοσήματι Id.Fr.486. II ὕ. εἰς ἀμίδα diabetes, Gal.8.394; cf. ὑδεροῦν ( = τὸν ὕδερον), which is cited from Hp. by Erot. (but = τὸ ὑδρηλὸν χωρίον acc. to Epicles ap. eund.), prob. with ref. to ὕδρωπες in Aër.4.