hamamelis. n. 1. (Plants) any of several trees or shrubs constituting the hamameliaceous genus Hamamelis, native to E Asia and North America and cultivated as ornamentals.See witch hazel.. (Plants) any of several trees or shrubs constituting the hamameliaceous genus Hamamelis, native to E Asia and North America and cultivated as ornamentals.
Diffusion tensor imaging (DTI). A refinement of magnetic resonance imaging that allows the doctor to measure the flow of water and track the pathways of white matter in the brain. DTI is able to detect abnormalities in the brain that do not show up on standard MRI scans.
NOTE: This article was published in March/April 2004. Decompression illness, or DCI, is a term used to describe illness that results from a reduction in the ambient pressure surrounding a body. A good example is what happens to your body when you&#39re surfacing after a dive. DCI encompasses two diseases, decompression sickness (DCS) and arterial gas embolism (AGE).