closed pyramidal surface

closed pyramidal surface

[¦klōzd ‚pir·ə¦mid·əl ′sər·fəs]
(mathematics)
A surface generated by a line passing through a fixed point and moving along a polygon in a plane not containing that point.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.