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• tropic
  tropic

  noun
• -tropic
  -tropic

  a combining form with the meanings “turned toward, with an orientation toward” that specified by the initial element (geotropic ), “having an affinity for, affecting” what is specified (lipotropic; neurotropic; psychotropic ), “affecting the activity of, maintaining” a specified organ (gonadotropic ).

tropic

¹ American  

[trop-ik] / ˈtrɒp ɪk /

noun

tropics plural

1. Geography.

   1. either of two corresponding parallels of latitude on the terrestrial globe, one tropic of Cancer about 23½° N, and the other tropic of Capricorn about 23½° S of the equator, being the boundaries of the Torrid Zone.

   2. the tropics, the regions lying between and near these parallels of latitude; the Torrid Zone and neighboring regions.

2. Astronomy. either of two circles on the celestial sphere, one lying in the same plane as the tropic of Cancer, the other in the same plane as the tropic of Capricorn.

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adjective

1. of, pertaining to, characteristic of, or occurring in the tropics; tropical.

   romance under the tropic skies of Old Mexico.

-tropic ² American  

1. a combining form with the meanings “turned toward, with an orientation toward” that specified by the initial element (geotropic ), “having an affinity for, affecting” what is specified (lipotropic; neurotropic; psychotropic ), “affecting the activity of, maintaining” a specified organ (gonadotropic ).

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tropic ¹ British  

/ ˈtrɒpɪk /

noun

1. (sometimes capital) either of the parallel lines of latitude at about 23 1/ 2 °N ( tropic of Cancer ) and 23 1/ 2 °S ( tropic of Capricorn ) of the equator

2. (often capital) that part of the earth's surface between the tropics of Cancer and Capricorn; the Torrid Zone

3. astronomy either of the two parallel circles on the celestial sphere having the same latitudes and names as the corresponding lines on the earth

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adjective

1. a less common word for tropical

-tropic ² British  

combining form

1. turning or developing in response to a certain stimulus

   heliotropic

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tropic Scientific  

/ trŏp′ĭk /

1. Either of the two parallels of latitude representing the points farthest north and south at which the Sun can shine directly overhead. The northern tropic is the Tropic of Cancer and the southern one is the Tropic of Capricorn.

2. tropics. The region of the Earth lying between these latitudes. The tropics are generally the warmest and most humid region of the Earth.

3. Also called Torrid Zone

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Usage

What does -tropic mean? The combining form -tropic is used like a suffix for a variety of meanings. It can indicate “turned toward, with an orientation toward” something specified by the first part of the word. This sense of -tropic is especially used in biology and botany. It can also denote “having an affinity for, affecting” a specified thing or “affecting the activity of, maintaining” an organ. Here, it can be synonymous with -trophic, which you can learn more about at our Words That Use article for the form. This sense of -tropic is especially used in biochemistry and physiology. Closely related to -tropic is -tropous. The combining forms -tropy and -tropism are used to form abstract nouns from concrete nouns using -tropous and -tropic (and vice versa). Where does -tropic come from?The form -tropic comes from the Greek suffix -tropos, meaning “pertaining to a turn." This suffix is based on trópos, “turn," and tropḗ, "a turning.”The Greek trópos is also the source of trope, tropical, and yes, the word tropic itself. It’s your turn to make the connection between “turning,” figures of speech, and the tropics at our entries for the words. Corresponding forms of -tropic combined to the beginning of words are tropo- and trop-. Discover their specific applications of our Words That Use articles for the forms.

Other Word Forms

Derived Forms

• nontropic
  adjective
• untropic
  adjective

Inflected Forms

Nouns

• tropics
  plural

Etymology

Origin of tropic¹

1350–1400; Middle English < Latin tropicus < Greek tropikós pertaining to a turn, equivalent to tróp ( os ) turn + -ikos -ic

Origin of -tropic²

see origin at tropic

Example Sentences

See Examples For:

tropic tropics

The country boasts having the highest number of hummingbirds and bats, attributed to its tropic climate and proximity to the equator.

From Science Daily ● Nov. 27, 2023

The engine that powers every tropic cyclone is convection: enormous volumes of moist, rising air create a vacuum at the surface that sucks in surrounding air as spiraling winds.

From Scientific American ● Jun. 1, 2023

Anterior pituitary hormones are sometimes referred to as tropic hormones, because they control the functioning of other organs.

From Textbooks ● Jun. 9, 2022

Textiles were an explosion of bright yellow against sky blue, with tropic prints featuring thatched cottages against flourishing banana trees, which Meribe said was meant to celebrate a return to more normality.

From Seattle Times ● Sep. 22, 2021

The trees and the tropic grass were burned and sad from the ferocious northern freeze.

From "Travels with Charley in Search of America" by John Steinbeck

The tropics receive far more energy from the sun than the poles.

From BBC ● Jul. 14, 2026

This includes drought across parts of the Amazon, Indonesia and Australia, disrupted monsoons in India, and shifting rainfall throughout the tropics.

From Barron's ● Jun. 11, 2026

What El Niño and its colder sibling pattern don’t affect, however, are “atmospheric rivers,” which can carry tremendous amounts of precipitation to California from the tropics, Ralph said.

From Los Angeles Times ● May 14, 2026

"It was hard sometimes but getting dressed up every day, and spending months in the tropics with 30 of my friends was so much fun," he said.

From BBC ● Feb. 14, 2026

Then, so suddenly that it seemed to come between one watch and the next, the steamy heat of the tropics descended.

From "Carry On, Mr. Bowditch" by Jean Lee Latham