Un'der-lay'er, n.
n. 1. One who underlays; that which underlays or is underlaid; a lower layer.
Sense 2. (Mining.) A perpendicular shaft sunk to cut the lode at any required depth. Weale.
n. 1. One who underlays; that which underlays or is underlaid; a lower layer.
Sense 2. (Mining.) A perpendicular shaft sunk to cut the lode at any required depth. Weale.