Wiktionary
n. (context science fiction English) A device which renders a person or thing invisible.
Wikipedia
A cloaking device is a theoretical or fictional stealth technology that can cause objects, such as spaceships or individuals, to be partially or wholly invisible to parts of the electromagnetic (EM) spectrum. However, over the entire spectrum, a cloaked object scatters more than an uncloaked object.
Fictional cloaking devices have been used as plot devices in various media for many years.
Developments in scientific research show that real-world cloaking devices can obscure objects from at least one wavelength of EM emissions. Scientists already use artificial materials called metamaterials to bend light around an object.
Usage examples of "cloaking device".
It came loose with a soft tearing sound, and he slapped the adhesive against the side of the cloaking device.
Whatever had earlier been wrong with its cloaking device had apparently been rectified.
Just beyond them he could see the distortion of the cloaking device.
I have an idea about that cloaking device-a way to mimic its function without using the particle generator.