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sty·lus (stī́ləs)

[Latin, alteration (influenced by Greek stūlos, pillar), of stilus.]

noun: pl., -lus·es or -li (-lī) 

  1. A sharp, pointed instrument used for writing, marking, or engraving.
  2. Computer Science A pointed instrument used as an input device on a pressure-sensitive screen.
  3. A phonograph needle.
  4. A sharp, pointed tool used for cutting record grooves.