The Collaborative International Dictionary of English v.0.48:

Mycetozoa \My*ce`to*zo"a\, n. pl. [NL.; Gr. my`khs, my`khtos,
   fungus + ? pl. of zo^,on an animal.] (Zool.)
   The Myxomycetes; -- so called by those who regard them as a
   class of animals. -- My*ce`to*zo"an, a.
   [Webster 1913 Suppl.]