BARREL (Balloon Array for RBSP Relativistic Electron Losses)
WordNet
noun
(1) A cylindrical container that holds liquids
(2) A tube through which a bullet travels when a gun is fired
(3) Any of various units of capacity
"A barrel of beer is 31 gallons and a barrel of oil is 42 gallons"
(4) The quantity that a barrel (of any size) will hold
(5) A bulging cylindrical shape; hollow with flat ends
verb
(6) Put in barrels