-enn-

== English == === Etymology === Reduced form of ennea-, from Ancient Greek ἐννέα (ennéa, “nine”). === Prefix === enn- (chemistry) Used for the digit nine to form systematic element names of elements whose existence has been predicted, and which have not yet been given a trivial name. ‎un- (“1”) + ‎un- (“1”) + ‎enn- (“9”) + ‎-ium (element suffix) → ‎ununennium (“element 119”) ==== Derived terms ====