The Collaborative International Dictionary of English v.0.48:

Kale \Kale\, n. [Scot. kale, kail, cale, colewort, Gael. cael;
   akin to Ir. cal, W. cawl, Armor. kaol. See Cole.]
   [1913 Webster]
   1. (Bot.) A variety of cabbage in which the leaves do not
      form a head, being nearly the original or wild form of the
      species. [Written also kail, and cale.]
      [1913 Webster]

   2. See Kail, 2.
      [1913 Webster]

   Sea kale (Bot.), a European cruciferous herb (Crambe
      maritima), often used as a pot herb; sea cabbage.
      [1913 Webster]

WordNet (r) 3.0 (2006):

kale
    n 1: informal terms for money [syn: boodle, bread,
         cabbage, clams, dinero, dough, gelt, kale,
         lettuce, lolly, lucre, loot, moolah, pelf,
         scratch, shekels, simoleons, sugar, wampum]
    2: a hardy cabbage with coarse curly leaves that do not form a
       head [syn: kale, kail, cole, borecole, colewort,
       Brassica oleracea acephala]
    3: coarse curly-leafed cabbage [syn: kale, kail, cole]