(chem) the reversible interconversion of a pair of organic isomers as a result of the migration of an ionic part of the molecule
noun 1. Rocketry. a projected type of propulsion for vehicles in outer space, the exhaust consisting of positive ions and negative electrons repelled from the vehicle by electrostatic forces, resulting in a very high exhaust velocity.
noun, Rocketry. 1. a rocket or rocket engine using ion propulsion. noun 1. a rocket propelled by an ion engine
[ahy-on-tuh-fuh-ree-sis] /aɪˌɒn tə fəˈri sɪs/ noun 1. a painless alternative to drug injection in which a weak electrical current is used to stimulate drug-carrying ions to pass through intact skin. /aɪˌɒntəʊfəˈriːsɪs/ noun 1. (biochem) a technique for studying neurotransmitters in the brain by the application of experimental solutions to the tissues through fine glass electrodes […]
noun, Physics. 1. any device used to prevent ions in an electron beam from striking other apparatus, especially in mass spectrometry. ion trap A device, such as a magnet, used to prevent ions in an electron beam from striking another apparatus, such as a cathode-ray tube screen, which could cause it to lose luminescence.