プルテウスプルテウスMeanings1nounpluteusA term from biology referring to the free-swimming larval stage of sea urchins and brittle stars. Used in scientific contexts.from Latinウニのプルテウス幼よう生せいはプランクトンとして海かい中ちゅうを漂ただよう。The pluteus larva of sea urchins drifts in the ocean as plankton.