Definitions:

1. A small file made of soft metal, or a board covered with fine sandpaper, for filing and shaping one's fingernails and toenails. NOUN
   • The nail file is an essential tool for any nail care routine.
2. A small grooming tool used to shape, smooth, and refine the edges of fingernails and toenails. NOUN
   • After trimming his nails, he used a nail file to smooth the edges.
3. A small strip of metal or paper with a rough surface used for making the edges of your nails smooth and curved. NOUN
   • Using a glass nail file is gentler on the nails than a metal one.

Synonyms:

• emery board
• manicure file
• nail buffer
• nail grooming tool