かいじょう 海上 Common word LinksSentence search for 海上Sentence search for かいじょうSentence search for かいしょうKanji details for 海 and 上Edit in JMdict Noun, Noun which may take the genitive case particle 'no'1. (on the) sea; surface of the seaOther forms海上 【かいしょう】Notesかいしょう: Out-dated or obsolete kana usage. Discussions Log in to talk about this word.