[zee-nuh-thuh l or, esp. British, zen-uh-]
Origin of zenithal
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for zenithal
It is obvious that all perspective projections are zenithal.
All round the horizon is built a black cloud-wall, but the zenithal heaven is clear.Hours of Exercise in the Alps
It is clear that perspective and zenithal projections are particular groups of conical projections.
Of the above 25 projections, 23 are conical or quasi-conical, if zenithal and perspective projections be included.