A scientist or scholar who studies and describes Mars, including its geography and physical features.
From Ares (Mars) plus Greek 'graphia' (writing/description). The term was created in the 19th century as telescopic observation of Mars became more detailed and systematic.
Before we had rovers, astronomers like Giovanni Schiaparelli who studied Mars were literally called 'areographers'—they were mapping an entire planet using only telescopes from Earth!
Complete word intelligence in one call. Free tier — 50 lookups/day.