ἐφιάλτιον
From LSJ
ἐγώ εἰμι τὸ φῶς τοῦ κόσμου· ὁ ἀκολουθῶν μοι οὐ μὴ περιπατήσῃ ἐν τῇ σκοτίᾳ ἀλλ' ἕξει τὸ φῶς τῆς ζωῆς → I am the light of the world; he that followeth me shall not walk in darkness but shall have the light of life (John 8:12)
English (LSJ)
τό, = δρακοντία μικρά, dragonroot, green dragon, Ps.-Dsc.2.167.
German (Pape)
τό, ein Kraut, das gegen Alpdrücken schützen sollte, Sp.