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underlay

(Science: chemical) To incline from the vertical; to hade; said of a vein, fault, or lode.

1. (Science: chemical) The inclination of a vein, fault, or lode from the vertical; a hade; called also underlie.

2. A thickness of paper, pasteboard, or the like, placed under a cut, or stereotype plate, or under type, in the from, to bring it, or any part of it, to the proper height; also, something placed back of a part of the tympan, so as to secure the right impression.