WordNet (r) 3.0 (2006):

Gymnomycota
    n 1: slime molds; organisms having a noncellular and
         multinucleate creeping vegetative phase and a propagative
         spore-producing stage: comprises Myxomycetes and
         Acrasiomycetes; in some classifications placed in the
         kingdom Protoctista [syn: Myxomycota, division
         Myxomycota, Gymnomycota, division Gymnomycota]