* * *open 'ō-pən adj1 a) not covered, enclosed, or scabbed over <an \open lesion> <an \open running ulcer>b) not involving or encouraging a covering (as by bandages or overgrowth of tissue) or enclosure <\open treatment of burns>c) relating to or being a compound fractured) being an operation or surgical procedure in which an incision is made such that the tissues and organs are fully exposed compare OPEN-HEART2) shedding the infective agent to the exterior <\open tuberculosis> compare CLOSED (3)3 a) unobstructed by congestion or occlusion <\open sinuses>b) not constipated <\open bowels>4) using a minimum of physical restrictions and custodial restraints on the freedom of movement of the patients or inmates <an \open psychiatric ward>1 a) to make available for entry or passage by removing (as a cover) or clearing away (as an obstruction)b) to free (a body passage) of congestion or occlusion <an inhalator for \opening congested nasal passages> <\open clogged arteries>2) to make one or more openings in <\opened the boil> vi to spread out <the wound \opened>
* * *(oґpən) 1. exposed to the air; not covered by unbroken skin. 2. interrupted (as a circuit) so that an electric current cannot pass. 3. not obstructed or closed. 4. pertaining to a clinical trial or other experiment that is not blind; i.e., the subjects and the persons administering the test know which treatment is administered to which subject.
Medical dictionary. 2011.