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lias |
1 definition found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Lias \Li"as\ (l[imac]"as), n. [Cf. F. lias, fr liais sort of limestone, OF also liois; perh. of Celtic origin, cf Armor. liach, leach, a stone, Gael. leac, W. llech. Cf {Cromlech}.] (Geol.) 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 O["o]lite. See the Chart of {Geology}.
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