海かい草そうTop 30000MeaningsNoun1. marine plant; seagrassShow all meanings (1 more)Other readings海うみ草くさ海うみ草ぐさKanji used海sea草grassPitch accentかいそうExamples2あなたの国くにでは海かい草そうを食たべますか。Do you eat seaweed in your country?海かい草そうを食たべたのは初はじめてです。This is the first time I've had seaweed.