Printing in East Asia evolved from ink rubbings made on paper or cloth from texts on stone tables in China during the Han dynasty. Mechanical woodblock printing on paper started in China during the Tang dynasty before the 8th century CE. Use of woodblock printing quickly spread to other East Asian countries. While the Chinese used only clay and wood movable type at first, use of metal movable type was pioneered in Korea by the 13th century. The Western-style printing press became known in East A
Definition of 'overhead projector'. overhead projector. An overhead projector is a machine that has a light inside it and makes the writing or pictures on a sheet of plastic appear on a screen or wall. The abbreviation OHP is also used. COBUILD Advanced English Dictionary.
Definition of projector. 1  1 : one that plans a project; specifically : promoter. 2  2 : one that projects: such asa : a device for projecting a beam of lightb : an optical instrument for projecting an image upon a surfacec : a machine for projecting motion pictures on a screen. 3 : an imagined line from an object to a surface along which projection takes place.