σέριφον
From LSJ
ψυχῆς πείρατα ἰὼν οὐκ ἂν ἐξεύροιο πᾶσαν ἐπιπορευόμενος ὁδόν· οὕτω βαθὺν λόγον ἔχει → one would never discover the limits of soul, should one traverse every road—so deep a measure does it possess
English (LSJ)
τό, a kind of A wormwood, = σαντονικόν (q.v.), Dsc.Prooem. 8, Id.3.23, Gal.11.804. II γραῦς σέριφος or σερίφη, an insect, = μάντις 11, a name used for an old maid, Zen.2.94, Suid.