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2 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 underlayer
 下墊層; 底墊; 墊底層

From: Webster's Revised Unabridged Dictionary (1913)

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