FRETUM Meaning of FRETUM in English ˈfrēd.əm, -ētəm noun( plural fre·ta -ēd.ə, -ētə)Etymology: Latin; probably akin to Latin fervēre to boil — more at burn : an arm of the sea : strait Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012