equinoctial

[ee-kwuh-nok-shuh l, ek-wuh-]

See more synonyms for equinoctial on Thesaurus.com

adjective

pertaining to an equinox or the equinoxes, or to the equality of day and night.
pertaining to the celestial equator.
occurring at or about the time of an equinox.

Botany. (of a flower) opening regularly at a certain hour.

noun

Origin of equinoctial

1350–1400; Middle English < Latin aequinoctiālis pertaining to the equinox. See equinox, -al¹

Related formsin·ter·e·qui·noc·tial, adjective

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for equinoctial

Historical Examples

For the Equinoctial Circle does not cut the Zodiac at right angles.
The Non-Christian Cross
John Denham Parsons
An equinoctial gale was raging, or rather had been raging all day.
The First Violin
Jessie Fothergill
The "Ranger" had encountered an equinoctial gale in its worst form.
The Naval History of the United States
Willis J. Abbot.
I don't know if you remember that equinoctial gale that blew about the 18th or 19th.
My New Curate
P.A. Sheehan
They will in all probability be caught in the equinoctial gales.
Flora Lyndsay
Susan Moodie

British Dictionary definitions for equinoctial

equinoctial

adjective

relating to or occurring at either or both equinoxes
(of a plant) having flowers that open and close at specific regular times
astronomy of or relating to the celestial equator

noun

a storm or gale at or near an equinox
another name for celestial equator

Word Origin

C14: from Latin aequinoctiālis concerning the equinox

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

equinoctial in Science