Etymology
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Mardi Gras (n.)

 "Shrove Tuesday, last day of carnival, day of eating and merrymaking before the fasting season of Lent," 1690s, French, literally "fat Tuesday," from mardi "Tuesday" (12c. in Old French, from Latin Martis diem "day of the planet Mars;" see Tuesday) + gras "fat," from Latin crassus, "thick," which is of unknown origin.

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Definitions of Mardi Gras

Mardi Gras (n.)
the last day before Lent;
Synonyms: Shrove Tuesday / Fat Tuesday / pancake day
Mardi Gras (n.)
a carnival held in some countries on Shrove Tuesday (the last day before Lent) but especially in New Orleans;
Synonyms: Fat Tuesday
From wordnet.princeton.edu