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Martian

American  
[mahr-shuhn] / ˈmɑr ʃən /

adjective

  1. of, relating to, or like the planet Mars or its hypothetical inhabitants.


noun

  • Martians
    plural
  1. a supposed inhabitant of the planet Mars.

    The science-fiction novel was about the invasion of our planet by Martians.

Martian British  
/ ˈmɑːʃən /

adjective

  1. of, occurring on, or relating to the planet Mars

"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

noun

  1. an inhabitant of Mars, esp in science fiction

"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

Other Word Forms

Derived Forms

Inflected Forms

Nouns

Etymology

Origin of Martian

1350–1400; Middle English marcien < Latin Mārti ( us ) of, belonging to Mars ( see March) + -an

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

The researchers analyzed seismic data collected by NASA's InSight mission, focusing on waves generated by meteoroid impacts and marsquakes, the Martian equivalent of earthquakes.

From Science Daily Sep. 4, 2026

MMX is designed to study both Martian moons in detail and return samples from Phobos to Earth.

From Science Daily Aug. 26, 2026

One theory for the origin of the Martian moons -- the "giant impact" hypothesis -- is that they formed after a celestial body collided with Mars.

From Barron's Aug. 16, 2026

"Imagine you're a Martian, you're just about to invade Earth, you're hiding in the moon... and suddenly you meet the martial music of the bagpipe."

From BBC Jul. 30, 2026

To test this question, many years ago my colleagues and I prepared chambers that simulated the Martian environment as it was then known, inoculated them with terrestrial microorganisms and waited to see if anybody survived.

From "Cosmos" by Carl Sagan

“The first new Martians in at least a billion years,” he observes, “are not biological; they are robotic.”

From The Wall Street Journal Jan. 9, 2026

Quirk was always a few covers away: The Day The Martians Landed, screamed one headline, with two alien spaceships looming dramatically; or ESP: Fact Or Fiction, as part of a series of "eternal controversies".

From BBC Dec. 27, 2023

As the Martians begin to emerge from a large meteorite, one character asks, “What are we going to say to them?”

From Los Angeles Times Oct. 30, 2023

Belief in Martians sprang in large part from a wealthy amateur astronomer, Percival Lowell, who built the observatory that still bears his name.

From Scientific American Aug. 25, 2023

Yet few of the two thousand letters mention a person hysterical enough to escape the Martians by leaving his or her home.

From "Spooked!" by Gail Jarrow

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