ἑρμοδάκτυλον
From LSJ
Δελφῖνα νήχεσθαι διδάσκεις: ἐπὶ τῶν ἐν ἐκείνοις τινὰ παιδοτριβούντων, ἐν οἷς ἤσκηται → Teaching dolphins to swim: is applied to those who are teaching something among people who are already well versed in it
English (LSJ)
τό, a plant, in two varieties, Colchicum luteum and autumnale, [Gal.] 14.760, Alex.Trall. 11.
