decuman

adjective
dec·​u·​man | \ ˈdekyəmən\

Definition of decuman

1 of a wave : extremely large : huge that decuman wave that took us fore and aft— P. A. Motteux
2 : of or relating to the tenth cohort used especially of the chief gate of a Roman camp

History and Etymology for decuman

Latin decumanus, decimanus of the tenth, large, from decumus, decimus tenth (from decem ten) + -anus -an

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