A serious complication of peptic ulcers where the ulcers penetrate through the stomach or duodenum allowing their contents to enter the peritoneal space
A series of small slits produced on a folder in the printed sheet, parallel to the fold at the bind edge, which permits the paper to be separated easily at these slits (perforations); also called Commercial Perforation to top
the act of punching a hole (especially a row of holes as for ease of separation) a line of small holes for tearing at a particular place a hole made in something; "a perforation of the eardrum
The punching out of holes between stamps to make separation easy 1) Comb perforation-three sides of a stamp are perforated at once, with the process repeated in rows 2) Harrow perforation-the entire sheet or unit of stamps is perforated in one operation 3) Line perforation-holes are punched one row at a time Line perforations are distinguished by the uneven crossing of perforation lines and irregular corners Comb and harrow perforations usually show alignment of holes at the corners Some forms of perforation may be difficult to distinguish