See Also: Lias(medicine)
lias(dictionary)

lias (iou)



lias noun. In sense 1 orig. lyas; in sense 2 usu. Lias. LME.
[Old French liais hard limestone, prob. from lie LEE noun2.]
1. A kind of blue argillaceous limestone rock, esp. as it occurs in SW England. LME.
2. Geology. the Lias, a series of fossiliferous strata forming the lowest division of the Jurassic system, and including blue argillaceous limestones. E19.
liassic adjective (Geology) of or pertaining to the Lias M19.