Jotnian

adjective
Jot·​ni·​an | \ˈjätnēən\

Definition of Jotnian 

: of, relating to, or constituting a division of the Precambrian

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History and Etymology for Jotnian

Old Norse jötn-, jötunn giant + English -ian; akin to Old English eoten giant, Middle Low German eteninne giantess, and perhaps to Old English etan to eat

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