海かい藻そうかいそうCommon word›JLPTN1›Freq.FrequencyTop 50,000じ字FuriganaMeanings1nounseaweed; marine algaeGeneral term for macroscopic marine algae, including kelp, wakame, and nori. Used in everyday contexts as well as scientific ones.海かい岸がんにたくさんの海かい藻そうが打うち上あげられていた