Metalwork, needlework, etc., having decorative or ornamental openings.

Something resembling lace fabric or its patterns; spec. ornamental metalwork, stonework, etc., having an intricate openwork design.

transferred and figurative. Any delicate interweaving of lines or threads, as in embroidery, carving, etc.; also, an interlacing of boughs or…

Something made up of interlaced elements; lacelike work; a lacelike pattern. Also figurative.

= honeycomb work n. at compounds 2.