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Passage of a missile completely through an object.
(science and technology)
Any hole made by boring, punching, or piercing.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(1) In botany, an opening in the cell membrane of a vessel in vascular plants. Water passes freely through the perforations and into the vessels. The perforations may be on the lateral and transverse walls of the cells. If a perforation is single, it is called a simple perforation (in the vessels of oaks and herbs). Multiple perforations are arranged in parallel series (scalariform perforations), in an irregular network (reticulate perforations), or as a group of approximately circular holes (foraminate perforations). Ferns have scalariform perforations, ivies reticulate perforations, and ephedras foraminate perforations.

(2) In medicine, the penetration of the wall of a hollow or tubular organ, for example, the intestine.



in medicine, an opening or hole in the wall of a cavitary or tubular organ, as a result of which the cavity of the organ communicates with surrounding cavities or tissues.

Perforation may be caused by intrusion of a foreign body from the lumen of an organ (for example, perforation of the esophagus by a swallowed bone) or externally (a penetrating knife or bullet wound). It may also be caused by disruption of all layers of an organ by a pathological process, for example, perforation of an ulcer or tumor of the stomach or intestine or perforation of the vermiform appendix or the gallbladder with gangrenous appendicitis or cholecystitis.

When there is a perforation, the contents of a hollow organ, by penetrating surrounding tissue (periesophageal or perirectal) or the abdominal cavity, cause development of a rapidly progressing purulent inflammatory process called mediastinitis, paraproctitis, or peritonitis. Treatment consists in emergency surgery.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
MRI shows nasal septal perforation in horizontal (a) and coronal (b) sections.
Jones, "The investigation of nasal septal perforations and ulcers," Journal of Laryngology & Otology, vol.
Nasal septal perforation. Nasal septal perforation should alert radiologists and clinicians to the possibility of serious underlying systemic or local disease.
More recently, abuse of intranasal formulations of prescription hydrocodone and codeine have been implicated in nasal septal perforation, with some of these cases being complicated by fungal rhinitis.
The diagnosis of nasal septal perforation is usually made clinically by direct endoscopic examination of the nasal passages.
Treatment of nasal septal perforation centers on alleviation of symptoms and treatment of the underlying cause or, in the case of intranasal drug abuse or dependency, removal of the offending agent.
(7) They treated a known cocaine abuser who had a nasal septal perforation, an oronasal fistula, and a positive c-ANCA test.
The physical examination revealed the presence of several small oral and pharyngeal ulcers and a 1.5 x 1.0-cm anterior nasal septal perforation with adjacent crusting and mildly irregular mucosal edema (figure 1).
The causes of nasal septal perforations include trauma, surgery, cocaine abuse, cauterization, infection, inflammation, and neoplasm.