type of projection used in making maps of large areas
See full dictionary entry for polyconic
polyconic projection in British English
(ˌpɒlɪˈkɒnɪk)
noun
a type of conic projection in which the parallels are not concentric and all meridians except the central one are curved lines. It is neither equal-area nor conformal, but is suitable for maps of areas or countries of great longitudinal extent
polyconic projection in American English
(ˌpɑlɪˈkɑnɪk)
a type of conic map projection in which the parallels are represented as arcs of circles having centers at different points along the straight central meridian and the other meridians are shown as curves