かんそくききゅう 観測気球 LinksSentence search for 観測気球Sentence search for かんそくききゅうKanji details for 観, 測, 気 and 球Edit in JMdict Noun1. weather balloon; sounding balloonNoun2. observation balloon; espionage balloon; spy balloonNoun3. trial balloon Discussions Log in to talk about this word.