a. A wedge-shaped piece of wood used to tighten timber sets against the roof and sides. See also: lag; lid. Nelson
b. A tapered piece of material used to initiate the deflection of a borehole. See also: deflecting wedge; Hall-Rowe wedge. Long
c. Tapered piece of core that tends to bind and block a core barrel. Long
d. A piece of mica that, on splitting, yields pieces thicker at one end than at the other. Skow
e. The shape of a stratum, vein, or intrusive body that thins out; specif. a wedge-shaped sedimentary body, or prism. See also: prism
Source:
Dictionary of Mining, Mineral, and Related Terms












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