Definition of overhead projector noun from the Oxford Advanced Learner's Dictionary

 

overhead projector

 noun
noun
BrE
 
; NAmE
 
(abbreviation OHP)
 
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a piece of equipment that projects an image onto a wall or screen so that many people can see it She used an overhead projector to illustrate her talk. compare data projector, slide projector
See the Oxford Advanced American Dictionary entry: overhead projector