Definition of lias Lias
Li•as
We found 4 definitions of lias from 3 different sources.
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What does lias mean?
Wiktionary 
- lias (Noun)
A type of blue limestone present in parts of southern England. - lias (Noun)
A stratigraphic group from the lower Jurassic period, consisting of thin layers of blue limestone.
Webster DictionaryWebster's Unabridged Dictionary 📘
- lias (n.)
The lowest of the three divisions of the Jurassic period; a name given in England and Europe to a series of marine limestones underlying the Oolite. See the Chart of Geology.
Chambers DictionaryChamber's 20th Century Dictionary 📕
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lias
lī′as, n. (geol.) a formation of argillaceous limestone, &c., underlying the oolitic system.—adj. Lias′sic, pertaining to the lias formation. [Fr., perh. Bret. liach, a stone, Gael. leac, a stone.]
