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Boring

1. The act or process of one who, or that which, bores; as, the boring of cannon; the boring of piles and ship timbers by certain marine mollusks. One of the most important applications of boring is in the formation of artesian wells. (Tomlinson)

2. A hole made by boring.

3. The chips or fragments made by boring. Boring bar, a revolving or stationary bar, carrying one or more cutting tools for dressing round holes.

(Science: chemistry) boring tool, a cutting tool placed in a cutter head to dress round holes.