Wiktionary
multimillennial
a. Of or pertaining to more than one millennium.
Usage examples of "multimillennial".
And were those others - those shocking elder things of the mad winds and daemon pipings - in truth a lingering, lurking menace, waiting and slowly weakening in black abysses while varied shapes of life drag out their multimillennial courses on the planet's age-racked surface?
And were those others--those shocking Elder Things of the mad winds and daemon pipings--in truth a lingering, lurking menace, waiting and slowly weakening in black abysses while varied shapes of life drag out their multimillennial courses on the planet's age-racked surface?