[zee-nuh-thuh l or, esp. British, zen-uh-]
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  1. of or relating to the zenith; situated at or near the zenith.
  2. (of a map) drawn to indicate the actual direction of any point from the center point.

Origin of zenithal

First recorded in 1855–60; zenith + -al1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Historical Examples of zenithal