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.
Three ostrich species can be found in a strip of central Africa, while another dwells in a more southern part of the continent. Smallest â Africaâs smallest bird is called the Southern (or âCapeâ) Penduline-tit. It is only 3.93 inches (10 centimeters) tall and weighs only about 0.28 ounces (8 grams). Keeping to its name, it is distributed throughout a number of Africaâs southern countries: Angola, Botswana, Namibia, South Africa and Zimbabwe.