booster

Universal Words noun 1 (also booster rocket) a rocket that gives a spacecraft extra power when it leaves the earth, or that makes a MISSILE go further 2 a device that gives extra power to a piece of electrical equipment 3 an extra small amount of a drug that is given to increase the effect of one given earlier, for example to protect you from a disease for longer: a tetanus booster 4 a thing that helps, encourages or improves sb/sth: a morale / confidence booster 5 (especially AmE) a person who gives their support to sb/sth, especially in politics: a meeting of Republican boosters