gar ‧ gan ‧ tu ‧ an /ɡɑːˈɡæntʃuən $ ɡɑːr-/ BrE AmE adjective written
[ Date: 1500-1600 ; Origin: Gargantua , name of a giant in the book Gargantua (1534) by François Rabelais ]
extremely large SYN gigantic :
a meal of gargantuan proportions
gargantuan task