Definition of eraser noun from the Oxford Advanced Learner's Dictionary

eraser

noun
ɪˈreɪzə(r)
 
; ɪˈreɪsər
 
(North American English or formal) (British English also rubber)
 
a small piece of rubber or a similar substance, used for removing pencil marks from paper; a piece of soft material used for removing chalk marks from a blackboard