πεντάφυλλον
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 cinquefoil, Potentilla reptans, Hp.Morb.2.42, Thphr.HP9.13.5, Gal.12.96 ; also Potentilla argentea, Hp.Ulc.20 :—written πεντέφυλλον Dsc.4.42, but πεντάφ- Id.1 Prooem.
German (Pape)
[Seite 557] τό, Fünffingerkraut, Diosc.
Dutch (Woordenboekgrieks.nl)
πεντάφυλλον -ου, τό [πεντα-, φύλλον] vijfvingerkruid.