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Lewisian

adjective
Lew·i·sian | \ (ˈ)lü¦izh(ē)ən \

Definition of Lewisian 

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

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History and Etymology for Lewisian

Lewis, northern part of the island of Lewis with Harris, Outer Hebrides + English -ian

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lewisson

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biannual

occurring twice a year or every two years

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