ἰάνθινος
From LSJ
ξένῳ δὲ σιγᾶν κρεῖττον ἢ κεκραγέναι → it's better for a stranger to keep silence than to shout (Menander)
English (LSJ)
η, ον, (ἴον, ἄνθος)
A violet-coloured, ἱμάτιον Str.15.3.19, cf. Plin.HN21.27, Aq., Sm.Ex.25.5:—Subst. ἴανθος, ὁ, or ἴανθον, τό,= ἴον, Hsch., Theognost.Can.18.
German (Pape)
[Seite 1233] violetfarbig, Plin. H. N. 21, 6.