観かん測そく気き球きゅうMeaningsNoun1. weather balloon; sounding balloon2. observation balloon; espionage balloon; spy balloon3. trial balloonKanji used観observe測survey気state of mind球spherePitch accentかんそくききゅうComposed of観かん測そくobservation; survey; measurement; opinion; prediction; thinkingNoun気き球きゅうballoon (hot-air, weather, etc.); blimpNoun