海洋投棄 かいようとうき Meanings Noun dumping at sea Kanji 海 sea. Read as カイ. 洋 ocean. Read as ヨウ. 投 throw. Read as トウ. 棄 renounce. Read as キ. Words containing 海洋投棄 海洋投棄規制条約 (かいようとうききせいじょうやく) Convention on the Prevention of Marine Pollution by Dumping of Wastes and Other Matter (1972) Jinuma: Japanese Dictionary · Word lists