1. (a.) Pertaining to an equinox, or the equinoxes, or to the time of equal day and night; as, the equinoctial line.

2. (a.) Pertaining to the regions or climate of the equinoctial line or equator; in or near that line; as, equinoctial heat; an equinoctial sun.

3. (a.) Pertaining to the time when the sun enters the equinoctial points; as, an equinoctial gale or storm, that is, one happening at or near the time of the equinox, in any part of the world.

4. (n.) The equinoctial line.

arctic autumn autumnal beryl-green berylline blood-hot blood-warm blue-green bluish-green boreal brumal calid canicular chartreuse chloranemic chlorine chlorotic citrine citrinous emerald equatorial equinoctial foliaged genial glaucescent glaucous glaucous-green grassy green green as grass green-blue greenish greenish-blue greenish-yellow greensick hibernal hiemal holly ivy ivy-green leafy leaved luke lukewarm midsummer midwinter mild olivaceous olive olive-green out of season porraceous room-temperature seasonal smaragdine solstitial spring springlike subtropical summer summerlike summerly summery sunny sunshiny temperate tepid thermal thermic toasty tropical unfrozen verdant verdurous vernal vernant vert virescent warm warm as toast warmish winter winterlike wintery wintry yellowish-green