sweet lime

from WordNet (r) 3.0 (2006)

sweet lime
    n 1: lemon tree having fruit with a somewhat insipid sweetish
         pulp [syn: {sweet lemon}, {sweet lime}, {Citrus limetta}]

from The Collaborative International Dictionary of English v.0.48

Lime \Lime\, n. [F. lime; of Persian origin. See {Lemon}.]
   1. (Bot.) The fruit of the {Citrus aurantifolia}, allied to
      the lemon, but greener in color; also, the tree which
      bears it.

   Note: The term lime was formerly also applied to variants of
         the closely related {citron}, of which there are two
         varieties, {Citrus Medica}, var. acida which is
         intensely sour, and the

   {sweet lime} ({Citrus Medica}, var. Limetta) which is only
      slightly sour. See {citron}.
      [1913 Webster +PJC]

   2. The color of the lime[1], a yellowish-green.
      [PJC]