Definition of lias in English:

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lias

Pronunciation: /ˈlʌɪəs/

noun

(the Lias) Geology
1The earliest epoch of the Jurassic period, lasting from about 208 to 178 million years ago.
1.1The system of rocks deposited during the Lias, consisting of shales and limestones rich in fossils.
1.2 (also blue lias) [mass noun] A blue-grey clayey limestone derived from marl deposited in the Lower Jurassic, found chiefly in SW England.

Derivatives

liassic

Pronunciation: /lʌɪˈasɪk/
adjective

Origin

Late Middle English (denoting blue lias): from Old French liais 'hard limestone', probably from lie (see lees).

For editors and proofreaders

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