Martian UK /ˈmɑːʃən/US /ˈmɑɹʃən/adjective 4noun 3forms 2 adjective4 •Of or relating to the planet Mars, or (science fiction) its imagined inhabitants.Prof. Percival Lowell, the eminent Martian astronomer, said in a recent interview in New York: "The Martian canals are not Panama canals. The word 'canals' you know, really means 'lines.' [...]" — 1910 •Pertaining to the Roman god Mars, the god of war. •Pertaining to the astrological influence of the planet Mars; aggressive, bellicose. •(no longer used) Pertaining to battle or war; martial, military.The iudges vvhich thereto selected vvere, / Into the Martian field adovvne descended, / To deeme this doutfull case, for vvhich they all contended. — 1596 noun3 •An inhabitant of the planet Mars. •(rare) A male Martian. •A person under the astrological influence of the planet Mars. formsMartians · martians