Arable

from WordNet (r) 3.0 (2006)

arable
    adj 1: (of farmland) capable of being farmed productively [syn:
           {arable}, {cultivable}, {cultivatable}, {tillable}]

from The Collaborative International Dictionary of English v.0.48

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.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Arable \Ar"a*ble\, n.
   Arable land; plow land.
   [1913 Webster]

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