κεραυνὸν ἐν γλώττῃ φέρειν → carry a thunderbolt on his tongue
sĭon: ii, n., = σίον,I water - parsley: Sium latifolium, Linn.; Plin. 26, 8, 56, § 88; 22, 22, 41, § 84.
(1) sĭŏn ou sĭum, ĭī, n. (σίον) berle [plante] : Plin. 22, 84 ; 26, 88.