The Collaborative International Dictionary of English v.0.48:

Succotash \Suc"co*tash\, n. [Narragansett Indian m'sickquatash
   corn boiled whole.]
   Green maize and beans boiled together. The dish is borrowed
   from the native Indians. [Written also suckatash.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

succotash
    n 1: fresh corn and lima beans with butter or cream