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From The Collaborative International Dictionary of English v.0.48:
Openwork \O"pen*work`\, n. 1. Anything so constructed or manufactured (in needlework, carpentry, metal work, etc.) as to show openings through its substance; work that is perforated or pierced. [1913 Webster] 2. (Mining) A quarry; an open cut. --Raymond. [1913 Webster]