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  1.                 From GNU Collaborative International Dictionary of English, version 0.54:
                    

    Lias (līˈas), 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 Oölite. See the Chart of {Geology}.

    [1913 Webster]

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