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Adjective: equinoctial  ,ee-kwu'nók-shul
  1. Relating to the vicinity of the equator
     
  2. Relating to an equinox (when the lengths of night and day are equal)
Noun: equinoctial  ,ee-kwu'nók-shul
  1. The great circle on the celestial sphere midway between the celestial poles
    - celestial equator, equinoctial circle, equinoctial line

Derived forms: equinoctials

Type of: great circle