Definitions of slider:

• noun:   a fastball that curves slightly away from the side from which it was thrown
• noun:   freshwater turtle of United States and South America; frequently raised commercially; some young sold as pets
• noun:   someone who races the luge
• noun:   a person who slips or slides because of loss of traction
• name:  A surname (very rare: popularity rank in the U.S.: #25084)