Definition of Lewisian in English:

Lewisian

Line breaks: Lewis|ian
Pronunciation: /luːˈɪsɪən/

Entry from British & World English dictionary

adjective

Geology
1Relating to or denoting the earlier stage of the Proterozoic aeon in NW Scotland, from about 2,500 to 1,100 million years ago, when the oldest rocks in Britain were deposited.
1.1 (as noun the Lewisian) The Lewisian stage or the system of rocks deposited during it.

Origin

mid 19th century: from the name of the island of Lewis and Harris in the Outer Hebrides (where the chief outcrops of these rocks are found) + -ian.

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