[oh-uh-mahy-seet, -mahy-seet]
any of various algaelike fungi constituting the phylum Oomycota of the kingdom Fungi (or the class Oomycetes of the kingdom Plantae), characterized by the formation of oospores.

< Neo-Latin Oomycetes; see oo-, -mycete

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World English Dictionary
oomycete (ˌəʊəˈmaɪsiːt)
any organism of the phylum Oomycota (or Oomycetes), formerly classified as fungi but now usually included in the kingdom Protoctista or Protista: includes the water moulds and downy mildews

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American Heritage
Science Dictionary
oomycete   (ō'ə-mī'sēt')  Pronunciation Key 
Any of various nonphotosynthetic protists belonging to the phylum Oomycota and living in marine, freshwater, and soil environments. Oomycetes have cell walls made of cellulose or similar substances, and store their food as glycogen. They reproduce asexually by the formation of diploid spores (called zoospores) with two flagellae. Sexual reproduction involves the formation of a number of eggs within a structure called an oogonium. The eggs are fertilized by antheridia that penetrate the oogonium and deliver nuclei to the eggs. The oomycetes were formerly classified among the fungi because their filamentous bodies resembled fungal hyphae. The phylum includes several species that cause important plant diseases, such as late blight.
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Example sentences
The downy mildew damages its host but, unlike some other oomycete pests, keeps it alive.
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