docking station

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A device to which a laptop or notebook computer can be attached to provide easy access to a power supply and a collection of peripherals that are typically connected to desktop computers.
• noun A plug-in device with built-in speakers to which a portable media player can be attached, allowing audio files to be played out loud.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun computing A piece of hardware into which a laptop computer can be plugged for use as a desktop computer, peripherals such as the monitor being connected directly to the docking station.