RhymeZone: equinoxial definitions

Definitions of equinoxial:

adjective: (obsolete) Alternative form of equinoctial: of or related to the equinox. [(astronomy) Of or relating to the spring or autumnal equinox.]
noun: (obsolete) Alternative form of equinoctial [The great circle midway between the celestial poles; the celestial equator.]

(Definitions from Wiktionary)