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