BOOSTER

[boost.er] n (1890): one that boosts: as a: an enthusiastic supporter b: an auxiliary device for increasing force, power, pressure, or effectiveness c slang: 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; esp: booster shot