Ornamental work (such as embroidery or latticework) having a pattern of openings WordNet 3.0 & Open English WordNet

Openwork or open-work is a term in art history, architecture and related fields for any technique that produces decoration by creating holes, piercings, or gaps that go right through a solid material such as metal, wood, stone, pottery, cloth, leather, or ivory. Wikipedia

Artistic technique that produces decoration by creating holes or gaps through solid material Wikidata

Any of several forms of metalwork or needlework having decorative openings. Wiktionary

Metalwork or needlework having decorative openings. Wiktionary (translation)