equatorial

adjective
equa·​to·​ri·​al | \ ˌē-kwə-ˈtȯr-ē-əl, ˌe-kwə-\

Definition of equatorial 

1a : of, relating to, or located at the equator or an equator also : being in the plane of the equator a satellite in equatorial orbit
b : of, originating in, or suggesting the region around the geographic equator
2a : being or having a support that includes two axles at right angles to each other with one parallel to the earth's axis of rotation an equatorial telescope mount
b : extending in a direction essentially in the plane of a cyclic structure (as of cyclohexane) equatorial hydrogens — compare axial

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Synonyms & Antonyms for equatorial

Synonyms

low, tropical

Antonyms

polar

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Examples of equatorial in a Sentence

a lush equatorial rain forest that is threatened by rampant development

Recent Examples on the Web

Next comes a kitchen team—the president’s personal chefs from Cameroon—hauling jugs of palm oil and equatorial spices. Joe Parkinson, WSJ, "Can’t Find Cameroon’s President? Try Geneva’s Intercontinental Hotel," 4 Nov. 2018 The researchers found sublimation to be the dominant factor on equatorial Europa, the regions within 23 degrees of the moon's equator. Mike Wall, Space.com, "Jupiter Moon Europa's Jagged Ice Towers Could Imperil Robot Landers," 8 Oct. 2018 Head over here for a primer on what the equatorial Pacific Ocean looks like under neutral, El Niño, or La Niña conditions. Megan Barber, Curbed, "El Niño watch: Here’s what it means for cities," 19 Sep. 2018 What’s more, if all of Mars’ equatorial lakes did this, enough hydrogen gas would be released to push the climate above the freezing point. Scott K. Johnson, Ars Technica, "The secret to Mars’ past warmth could be beneath Curiosity’s wheels," 9 Aug. 2018 The computer simulations revealed that near-head-on collisions led to ravioli-like flattened objects with equatorial ridges, similar to the shapes of Pan and Atlas. Charles Q. Choi, Space.com, "Here's Why Saturn's Inner Moons Are Shaped Like Ravioli and Potatoes," 22 May 2018 There's thermal data from Galileo which shows heating consistent with formation of the ice spikes, and radar data hints at a jagged equatorial surface. John Wenz, Popular Mechanics, "Menacing Ice Spikes on Europa Could Endanger Future Landers," 8 Oct. 2018 But it was also found that in the equatorial regions, there isn’t much wind. Chris Lee, Ars Technica, "The deserts of Titan have organic dust storms," 4 Oct. 2018 The unrelenting equatorial sun scorches from above, and an explosion of chatter from shops just beyond a grove of spindly trees briefly breaks her focus. Deirdre Fernandes, BostonGlobe.com, "An education in hope," 7 July 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'equatorial.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of equatorial

1664, in the meaning defined at sense 1a

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Last Updated

14 Dec 2018

Look-up Popularity

Time Traveler for equatorial

The first known use of equatorial was in 1664

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More Definitions for equatorial

equatorial

adjective

English Language Learners Definition of equatorial

: of or relating to the equator : located at or near the equator

equatorial

adjective
equa·​to·​ri·​al | \ ˌē-kwə-ˈtȯr-ē-əl, ˌe-kwə-\

Kids Definition of equatorial

: relating to or lying near the equator an equatorial climate

equatorial

adjective
equa·​to·​ri·​al | \ ˌē-kwə-ˈtōr-ē-əl, ˌek-wə-, -ˈtȯr-\

Medical Definition of equatorial 

1 : of, located at, or relating to an equator equatorial diameter
2 : extending in a direction essentially in the plane of a cyclic structure (as of cyclohexane) equatorial hydrogen atoms — compare axial sense 2b

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