ἰσχυρόρριζος
From LSJ
θεοῦ θέλοντος κἂν ἐπὶ ῥιπὸς πλέοις → if God willed it, you could sail even on a straw mat | God willing, you may voyage on a mat
English (LSJ)
ον, (ῥίζα)
A with strong root, Thphr.CP2.12.3, etc.
Greek (Liddell-Scott)
ἰσχῡρόρριζος: -ον, (ῥίζα) ἰσχυρὰν ἔχων ῥίζαν, Θεοφρ. π. Φυτ. Αἰτ. 2. 12, 3, κτλ.