zenith-sunhttp://www.oed.com/dictionary/zenith-sun_n%3Ftab%3Dmeaning_and_usezenith sun, n.
Revised 2018

zenith sunnoun

  1. 1658–
    1. 1658
      These are the heats, and flames by which men under this Viall (as by a Zenith Sun) are scorched.
      E. Gee, Divine Right & Orig. Civill Magistrate Preface sig. a5
    2. 1826
      Deep-hued flowers that light Their tints at zenith suns.
      N. T. Carrington, Dartmoor 3
    3. 1926
      A zenith sun looks down upon every point between the Venezuelan and the Paraguayan frontiers of Brazil twice in each twelvemonth.
      R. Nash, Conquest of Brazil iii. 52
    4. 2014
      Vertical rays of light from the zenith sun illuminate these subterranean chambers.
      Latin Amer. Antiq. vol. 25 205

Originally published as part of the entry for zenith, n. & adj.

zenith, n. & adj. was revised in June 2018.