UNDERLAYER
Source: 567
Un″der‐lay′er (?), n. 1. 1. One who, or that which, underlays or is underlaid; a lower layer.
2. 2. (Mining) A perpendicular shaft sunk to cut the lode at any required depth. Weale.
Source: 567
Un″der‐lay′er (?), n. 1. 1. One who, or that which, underlays or is underlaid; a lower layer.
2. 2. (Mining) A perpendicular shaft sunk to cut the lode at any required depth. Weale.