Added 7 October 2026 xanthomonas noun Categories: AnimalsRare Words noun ! Definition from WordNet 3.1, Princeton University. More about xanthomonas at Wordnik → Where our words come from → A genus of bacteria similar to Pseudomonas but producing a yellow pigment that is not soluble in water. Related Words: phytophthorapythiumverticilliumsaccharomycesnematodetriticumoomycetes Back to today's word