Main Entry:

boost·er

Pronunciation:

\ˈbü-stər\

Function:

noun

Date:

1888

: one that boosts: as a: an enthusiastic supporter b: an auxiliary device for increasing force, power, pressure, or effectiveness cslang : shoplifter d: a radio-frequency amplifier for a radio or television receiving set e: the first stage of a multistage rocket providing thrust for the launching and the initial part of the flight f: a substance that increases the effectiveness of a medicament ; especially : booster shot