Function: noun
Date: 1951
: a projector for projecting onto a vertical screen magnified images of graphic material on a horizontal transparency illuminated from below ― called also overhead
Function: noun
Date: 1951
: a projector for projecting onto a vertical screen magnified images of graphic material on a horizontal transparency illuminated from below ― called also overhead
Merriam Webster Collegiate English Dictionary. Merriam Webster - Энциклопедический словарь английского языка. 2012