- 1. SYN: fenestra. 2. Any opening in space or time. 3. Radiology. A view especially contrived to accentuate tissue contrast.- aortic w. obsolete term for a radiolucent region below the aortic arch on a left anterior oblique chest radiograph, formed by the bifurcation of the trachea and crossed by the left pulmonary artery.- aortic-pulmonic w. SYN: aortopulmonary w..- aortopulmonary w. the indentation of the left side of the mediastinum by the lung partially interposed between the aortic arch and the left pulmonary artery, seen on frontal radiographs of the chest. SYN: aortic-pulmonic w..- cochlear w. SYN: round w..- mediastinal w. CT settings of w. level and width appropriate to showing soft tissue structures. SYN: soft tissue w..- oval w. [TA] an oval opening on the medial wall of the tympanic cavity leading into the vestibule, closed in life by the foot of the stapes. SYN: fenestra vestibuli [TA], fenestra of the vestibule, fenestra ovalis, vestibular w..- round w. [TA] an opening on the medial wall of the middle ear leading into the cochlea, closed in life by the secondary tympanic membrane. SYN: fenestra cochleae [TA], cochlear w., fenestra of the cochlea, fenestra rotunda.- tachycardia w. in paroxysmal tachycardia of the reentry type, the interval of time (the w.) between the earliest and latest premature activation that can excite the paroxysm.
* * *1) FENESTRA (1)2) a small surgically created opening: FENESTRA (2a)3) a usu. narrow interval of time or range of values for which a certain condition or an opportunity exists <coma and multiorgan failure can occur within hours and there may be a very narrow \window of opportunity for transplantation (J. P. A. Lodge)> see therapeutic window
* * *win·dow (winґdo) [L. fenestra] 1. a circumscribed opening in a surface; called also fenestra. t2. he upper and lower voltage limits that determine which pulses a pulse height analyzer will accept and pass on. 3. the range of Hounsfield units over which the gray scale is spread in a particular CT scan; there are different windows for different types of tissues, such as bone and soft tissue.
Medical dictionary. 2011.