IPA: /ˈlɔːn.tʃər/
KK: /ˈlɔntʃər/
A device used to launch or fire something, such as rockets or grenades.
The military used a powerful launcher to deploy the missiles.
Launcher → It is formed from "launch" (from Old French *lancer*, meaning to throw or hurl) and "-er" (meaning a person or thing that performs an action). The word "launcher" refers to a device or person that throws or hurls something, typically a projectile or a program.
Think of someone or something that 'throws' ('lancer') an object or starts an action — that's why a launcher is a device that launches something.