eraser

noun

1. 1

   One who erases.

2. 2

   A thing used to erase or remove something written or drawn by a pen or a pencil.

   “I have worn out the eraser on this pencil.”

3. 3

   A thing used to erase something written by chalk on a chalkboard, by marker on a whiteboard, or by some other erasable implement; a chalkboard eraser, whiteboard eraser, etc.

4. 4

   An overwriter program used to prevent data recovery.