Science / Chemistry / Alpha Particle: (42He) A particle that is commonly ejected from radioactive nuclei, consisting of two protons and two neutrons. Alpha particles are helium nuclei. Alpha particles have a mass of 6.644 655 98 × 10-27 kg or 4.001 506 1747 atomic mass units. [1998 CODATA values].
Particle Adjective Synonyms: atom, molecule, scintilla, spark, mote, suggestion, hint, suspicion, gleam, bit, crumb, jot, tittle, whit, mite, speck, dot, spot, iota, grain, morsel, shred, sliver, scrap, smidgen or smidgin
Science / Chemistry / Alpha Ray: (alpha-ray) alpha radiation A stream of alpha particles. Alpha rays rapidly dissipate their energy as they pass through materials, and are far less penetrating than beta particles and gamma rays. MORE
Health / Dentistry / Aluminum Oxide (Alpha Single Crystal): An inert highly biocompatible strong ceramic material from which endosseous implants are fabricated. MORE
Technology / Cell Phones / Alphanumeric: A message or other type of readout containing both letters (alphas) and numbers (numerics). In cellular, alphanumeric memory dial is a special type of dial-from-memory option that displays both the na MORE
Entertainment / Literature / Alphabetism: A word formed from the initial letters of other words (or syllables) pronounced with the letters of the alphabet--such as the IRS, CIA, the VP, or VIP. See further discussion under acronym. MORE
Science / Chemistry / Beta Particle: (ß-) An electron emitted by an unstable nucleus, when a neutron decays into a proton and an electron. In some cases, beta radiation consists of positrons ('antielectrons' which are identical to elect MORE