Source : Webster's Revised Unabridged Dictionary (1913)

Arable \Ar"a*ble\, a. [F. arable, L. arabilis, fr. arare to
   plow, akin to Gr. ?, E. ear, to plow. See {Earable}.]
   Fit for plowing or tillage; -- hence, often applied to land
   which has been plowed or tilled.

Arable \Ar"a*ble\, n.
   Arable land; plow land.

Source : WordNet®

arable
     adj : (of farmland) capable of being farmed productively [syn: {cultivable},
            {cultivatable}, {tillable}]