expressivity

expressivity The consistency of a genetic disease. For example, Marfan syndrome shows variable expressivity. Some persons with Marfan syndrome merely have long fingers and toes, and others have the full-blown disease, with dislocation of the lens and dissecting aneurysm of the aorta.

exposure

exposure In cognitive behavioral therapy, the process of exposing oneself to an event or a place that causes anxiety or panic. The intention of controlled exposure is to gradually lower the level of stress and anxiety associated with the stimulus, to eventually prevent panic attacks, obsessive-compulsive behaviors, and other unwanted reactions. See also cognitive behavior…

expectorant

expectorant A medication that helps bring up mucus and other material from the lungs, bronchi, and trachea. An example of an expectorant is guaifenesin, which promotes drainage of mucus from the lungs by thinning the mucus, and also lubricates the irritated respiratory tract.