1. A test of public opinion 
2. A balloon sent up to test air currents

Derived forms: trial balloons

Type of: balloon, dummy run [Brit], test, trial, trial run, tryout

Encyclopedia: Trial balloon

• magnesite
• magnesium
• magnesium bicarbonate
• magnesium carbonate
• magnesium hydroxide
• magnesium nitride
• magnesium oxide
• magnesium sulfate
• magnet
• magnetar
• magnetic
• magnetic attraction
• magnetic bottle
• magnetic bubble memory
• magnetic compass
• magnetic core
• magnetic core memory
• magnetic declination
• magnetic dip
• magnetic dipole
• magnetic dipole moment
• magnetic disc
• magnetic disk
• magnetic equator
• magnetic field