Radial: A word with diverse meanings in medicine and the biomedical sciences: 1  Pertaining to the radius, the smaller bone in the forearm. 2  The radial artery is so named because of its proximity to the radius. 3  Pertaining to the radius of a circle.
A 3D model of ethyne (acetylene), the simplest alkyne. In organic chemistry, an alkyne is an unsaturated hydrocarbon containing at least one carbonâcarbon triple bond. The simplest acyclic alkynes with only one triple bond and no other functional groups form a homologous series with the general chemical formula CnH2nâ2.
Ultra-low frequency waves have the smallest frequency. Many text books do not cover these waves and may only show AM radio waves with the smallest frequency. Ultra-low frequency (ULF) is used by the US Navy as they keep contact with submarines. Because ULF can penetrate solids and liquids, it is ideal for submarines.