[ 'lʌɪəs ]
■ noun
1》 ( Lias ) Geology the earliest epoch of the Jurassic period, from about 208 to 178 million years ago.
2》 (also blue ~ ) a blue-grey clayey limestone of this epoch, found chiefly in SW England.
Derivatives
~sic adjective
Origin
ME: from OFr. liais 'hard limestone', prob. from lie (see lees ).