* * *
open 'ō-pən adj
1 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 fracture
d) being an operation or surgical procedure in which an incision is made such that the tissues and organs are fully exposed compare OPEN-HEART
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>
* * *
(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.