τρίσχιστος
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)
ον,
A cloven in three, Sch.Nic.Al.347, An.Ox.2.307:— τρι-σχίστη, ἡ, gloss on Αἰγυπτία στυπτηρία, Gal.19.71.