| open skull fracture | A fracture with laceration of overlying scalp and/or mucous membrane. Synonym: compound skull fracture. (05 Mar 2000) |
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| 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) |
| fractures, open | Fractures in which there is an external wound communicating with the break of the bone. (12 Dec 1998) |