ἰοειδής · ioeidēs — LSJ
like the flower, purple
like the flower ἴον I, purple, in Hom. always of the sea, ἰοειδέα πόντον, whether calm or stormy, Il. 11.298, Od. 5.56, 11.107, Hes. Th. 844; κρήνη ib. 3.
II poisonous
(ἰός B) poisonous, κέντρον Nic. Th. 886; λοιγός ib. 243. [Nic. makes ῐ short, as conversely he has ῑάσι from ἴον (q.v.).]