decuman

adjective

dec·​u·​man

ˈdekyəmən

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

Word History

Etymology

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

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