Definition of Mars
1
: the Roman god of war — compare ares
2
: the planet fourth in order from the sun and conspicuous for its red color — see Planets Table
Test Your Vocabulary
Odd Habits and Quirks
-
- Which of the following best describes an easily irritated person?

Can you spell these 10 commonly misspelled words?
TAKE THE QUIZ
A daily challenge for crossword fanatics.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Share Mars
Time Traveler for Mars
The first known use of Mars was in the 14th century
See more words from the same century