Definition of pythium
1 capitalized : a genus of destructive root-parasitic fungi (family Pythiaceae) having filamentous sporangia, smooth-walled spherical oogonia, and stalked antheridia and including forms (as P. debaryanum) that cause damping-off
2 plural -s : any fungus of the genus Pythium pythium root necrosis
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Origin and Etymology of pythium
New Latin, from Greek pythein to cause to rot + New Latin -ium
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