polyconic projection

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A conic map projection having distances between meridians along every parallel equal to those distances on a globe. The central geographic meridian is a straight line, whereas the others are curved and the parallels are arcs of circles.

GNU Webster's 1913

1. adj. (Map Making) a projection of the earth's surface, or any portion thereof, by which each narrow zone is projected upon a conical surface that touches the sphere along this zone, the conical surface being then unrolled. This projection differs from conic projection in that latter assumes but one cone for the whole map. Polyconic projection is that in use in the United States coast and geodetic survey.

WordNet 3.0

1. n. a conic projection of a map having distances between meridians equal to those distances on a globe