slot-in

adjective
UK /ˈslɒt ɪn/
US /ˈslɑːt ɪn/

Something that you can slide right into a space made for it.

The slot-in card fits easily into the side of the game console.


OTHER MEANINGS

2. A person or thing that fits smoothly into a team or group.

She was a slot-in replacement for the injured player.

3. A small card or device designed to be pushed into a narrow opening.

He kept his slot-in memory card in his wallet.

4. A type of easy-to-insert part used in machines or furniture.

The shelf uses slot-in brackets that need no screws.