Definition of gargantuan adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ɡɑːˈɡæntʃuən//
; NAmE NAmE//ɡɑːrˈɡæntʃuən//
[usually before noun]
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extremely large synonym enormous a gargantuan appetite/meal Word Origin late 16th cent.: from Gargantua, the name of a voracious giant in Rabelais' book of the same name (1534), + -an.
See the Oxford Advanced American Dictionary entry: gargantuan