instrument for projecting an enlarged image
• (n.) A modification of the magic lantern, used esp. for throwing a magnified image of an opaque object on a screen, solar or artificial light being used.
Meg'a·scope noun [ Mega- + -scope : confer French mégascope .] A modification of the magic lantern, used esp. for throwing a magnified image of an opaque object on a screen, solar or artificial light being used. [ archaic]