cork

US /kɔːrk/
UK /kɔːrk/
"cork" picture
1.

a lightweight, impervious, elastic, and buoyant material, the thick outer bark of the cork oak, used for stoppers, insulation, and other purposes

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The bottle was sealed with a natural cork.
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Many wine bottles use cork stoppers.
:
stopperplugseal
2.

a piece of cork, especially one used as a stopper for a bottle

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He pulled the cork out of the wine bottle.
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The cork broke when I tried to open it.
:
stopperplug
1.

stop up (a bottle or other container) with a cork

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He carefully corked the wine bottle after pouring a glass.
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Remember to cork the bottle tightly to keep it fresh.
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stopperplugseal
:
corked