ἐν πέτροισι πέτρον ἐκτρίβων → by grinding stone against stones
psyllĭon: ĭi, n., = ψύλλιον,I a plant, fleabane, fleawort, Plin. 25, 11, 90, § 140; Cael. Aur. Acut. 3, 8, 97.
psyllĭon (-ĭum), ĭī, n. (ψύλλιον), plantain ou herbe aux puces : Plin. 25, 146.
