An object that uses the negative fluid pressure of air or water to adhere to nonporous surfaces, creating a partial vacuum. Suction cups are peripheral traits of some animals such as octopuses and squids, and have been reproduced artificially for numerous purposes. 

This tag refers to the suction cups actually found on cephalopods. For artificial cups or devices that function on the same principle, see the following: 

* [[breast pump]]
* [[milking machine]]
* [[nipple clamps]]
吸盤