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le boîtier

device, unit, case, casing

boît company + ier forms nouns denoting a person, occupation, or thing associated with the base
noun · masculine Rare #50,064
device, unit, case, casing Often refers to the case or housing of an electronic device, or to a small electronic unit.
FR: Le boîtier est branché à l’ordinateur.
EN: The device is connected to the computer.

Je n'y arrive pas, avec le boîtier.

I can't get it to work with the device.

— Santa Claus Is a Stinker (1982)

Arrache le boîtier en plastique !

Rip out the plastic casing!

— La Haine (1995)

Je garde ce boîtier.

I'm keeping this case.

— Le Bon, la Brute et le Truand (1966)