| open system | A system that exchanges energy and materials with the outside environment. (09 Oct 1997) |
|---|---|
| open tuberculosis | Pulmonary tuberculosis, tuberculous ulceration, or other form in which the tubercle bacilli are present in the excretions or secretions; in the lung, usually the result of cavity formation. (05 Mar 2000) |
| open wound | A wound in which the tissues are exposed to the air. (05 Mar 2000) |
| fractures, open | Fractures in which there is an external wound communicating with the break of the bone. (12 Dec 1998) |