Added 9 October 2026 vallisneria noun Categories: PlantsObscure Words noun ! Definition from WordNet 3.1, Princeton University. More about vallisneria at Wordnik → Where our words come from → Eelgrass; eel grass. Related Words: salviniasansevieriavolvariellaselaginellathallophytavalerianaceaeumbellulariaverticillataportulacacorallorhiza Back to today's word