Wiktionary
n. A cup made of flexible material, such as rubber, that uses suction as an adhesive.
Wikipedia
A suction cup, also known as a sucker, is an object that uses the negative fluid pressure of air or water to adhere to nonporous surfaces, creating a partial vacuum.
Suction cups are peripherial traits of some animals such as octopuses and squids, and have been reproduced artificially for numerous purposes.
Usage examples of "suction cup".
Gone are the days when a user had to wear a silly looking hat and glove -- Now you just attach a special combination electrode / suction cup to some part of your body.
An eighteen-inch length of wire extended from one end of it, terminating in a suction cup as large as the lid of a mayonnaise jar.
Had they set up that huge suction cup just to entertain a handful of hairy, smelly students, who went there to listen to the latest record with a Japanese headset?
It cut almost through, leaving the suction cup with its levered handle to pull the glass out.
They wrapped the plastic shield around their waist and put the torch and the suction cup devices into a dark sack.
He unbelted himself, popped one of the suction cup handholds off the wall, and pushed over to the little middeck area that opened behind the seats.
One of his contact lenses was neatly pocketed in a little suction cup.