Definition of "eraser"

One who erases.  examples

(Canada, US, Philippines) A thing used to erase or remove something written or drawn by a pen or a pencil.  examples

(Canada, US, Philippines) 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.  examples

(computing) An overwriter program used to prevent data recovery.  examples