Alpha Particle

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].

Other Words for Particle

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

Alpha Ray

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

Aluminum Oxide (Alpha Single Crystal)

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

Beta Particle

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


Science / Geology / Beta-Particle: An electron emitted with high energy and velocity from the nucleus of an atom during radioactive decay. MORE