suction cup

noun

a cup-shaped object of rubber, glass, plastic, etc., which, by producing a partial vacuum, can be made to adhere to or draw something to a surface.

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Based on the Random House Dictionary, © Random House, Inc. 2017.
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The mouth gaped flabbily open; above it was the suction cup that formed a snout; and above that, a row of staring, sightless eyes.

Astounding Stories, May, 1931 Various

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