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.
Not to be confused with Demographic shift. Demographic transition (DT) refers to the transition from high birth and death rates to low birth and death rates as a country develops from a pre-industrial to an industrialized economic system. This is typically demonstrated through a demographic transition model (DTM).