Lewis Short
(adjective) : sŭpĕrābĭlis, e, supero
* That may be got over or surmounted. *
* Lit.: murus,Liv. 25, 23, 12.
* Trop., that may be overcome or subdued, conquerable, superable (very rare): non est per vim superabilis ulli,Ov. Tr. 5, 8, 27: invictos et nullis casibus superabiles Romanos praedicabant,Tac. A. 2, 25: an talis caecitas ac debilitas ope humanā superabiles forent,i. e. curable,id. H. 4, 81.
Charlton T. Lewis, Charles Short, A Latin Dictionary