of, pertaining to, or like the planet Mars or its hypothetical inhabitants.
a supposed inhabitant of the planet Mars: The science-fiction novel was about the invasion of our planet by Martians.

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

trans-Martian, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
Martian (ˈmɑːʃən)
1.  of, occurring on, or relating to the planet Mars
2.  an inhabitant of Mars, esp in science fiction

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., marcien "of the planet Mars" (originally in reference to astrological influence), from L. Martius "pertaining to the planet Mars," from Mars (gen. Martis). The noun meaning "an inhabitant of the planet Mars" is attested from 1883.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

Martian definition

Packets that turn up unexpectedly on the wrong network because of bogus routing entries. Also a packet which has an altogether bogus (non-registered or ill-formed) internet address, such as the test loopback interface []. Such a packet will come back labelled with a source address that is clearly not of this earth. "The domain server is getting lots of packets from Mars. Does that gateway have a martian filter?"
[Jargon File]

The Free On-line Dictionary of Computing, © Denis Howe 2010
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