Definitions of cork:

• noun:   the plug in the mouth of a bottle (especially a wine bottle)
• noun:   a port city in southern Ireland
• noun:   outer bark of the cork oak; used for stoppers for bottles etc.
• noun:   (botany) outer tissue of bark; a protective layer of dead cells
• noun:   a small float usually made of cork; attached to a fishing line
• verb:   stuff with cork

  Example: "The baseball player stuffed his bat with cork to make it lighter"

• verb:   close a bottle with a cork
• name:  A surname (rare: 1 in 50000 families; popularity rank in the U.S.: #6879)