ῥιπός

From LSJ

ἐν δὲ τοῖς φυσικοῖς ἀεὶ οὕτως, ἂν μή τι ἐμποδίσῃ → in natural products the sequence is invariable, if there is no impediment | now with that which is natural it is always thus if there is no impediment

Source

French (Bailly abrégé)

gén. de ῥίψ.