oomycote noun1 •Any of a group of filamentous protists variously classified as the phylum Oomycota or the class Oomycetes in a more broadly circumscribed phylum.Marine oomycotes are eukaryotic mycelial decomposers that have swimming, biflagellate propagules and lie in the Kingdom Chromista (or Protoctista), phylum Oomycota. — 2007 formsoomycotes