The Collaborative International Dictionary of English v.0.48:
Cultivable \Cul"ti*va*ble\ (k?l"t?-v?-b'l), a. [Cf. F. cultivable.] Capable of being cultivated or tilled. --Todd. [1913 Webster]WordNet (r) 3.0 (2006):
cultivable adj 1: (of farmland) capable of being farmed productively [syn: arable, cultivable, cultivatable, tillable]