Mardi Gras mar·dig·ras US/ˈmɑrdiˌɡrɑ/ uncommon noun 1. the last day before Lent SynonymsMardi GrasShrove Tuesdaypancake day 2. the pre-Lenten festival of Shrove Tuesday SynonymsMardi GrasFat Tuesday Related words Broader terms carnivalChristian holy day Parts New OrleansShrovetide WordNet 2.1 (Princeton University). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.