What does "cork" mean?

Additional senses

1. 2.A mass of tabular cells formed in any kind of bark, in greater or less abundance. Note: Cork is sometimes used wrongly for calk, calker; calkin, a sharp piece of iron on the shoe of a horse or ox. Cork jackets, a jacket having thin pieces of cork inclosed within canvas, and used to aid in swimming. -- Cork tree (Bot.), the species of oak (Quercus Suber of Southern Europe) whose bark furnishes the cork of commerce.
2. 3.To stop with a cork, as a bottle.
3. 4.To furnish or fit with cork; to raise on cork. Tread on corked stilts a prisoner's pace. Bp. Hall. Note: To cork is sometimes used erroneously for to calk, to furnish the shoe of a horse or ox with sharp points, and also in the meaning of cutting with a calk.