Added 9 October 2026 pythium noun Categories: PlantsRare Words noun ! Definition from WordNet 3.1, Princeton University. More about pythium at Wordnik → Where our words come from → Any fungus of the genus Pythium. Related Words: spprotverticilliumeelwormsclerotiniasoilborneseedbornewirewormfusariumrhizoctoniawitchweedclubroot Back to today's word