The Collaborative International Dictionary of English v.0.48:

Sporophyte \Spo"ro*phyte\ (sp[=o]"r[-o]*f[imac]t), n. [Spore +
   Gr. fyto`n plant.] (Bot.)
   In plants exhibiting alternation of generations, the
   generation which bears asexual spores; -- opposed to
   gametophyte. It is not clearly differentiated in the life
   cycle of the lower plants. -- Spo`ro*phyt"ic, a.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

sporophyte
    n 1: the spore-producing individual or phase in the life cycle
         of a plant having alternation of generations