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  1. alpha particle a positively charged particle that is the nucleus of the helium atom; emitted from natural or radioactive isotopes
  2. alphabetical arranged in order according to the alphabet
  3. alphabetically in order from A to Z
  4. antiparticle a particle that has the same mass as another particle but has opposite values for its other properties; interaction of a particle and its antiparticle results in annihilation and the production of radiant energy
  5. heavy particle any of the elementary particles having a mass equal to or greater than that of a proton and that participate in strong interactions; a hadron with a baryon number of +1
  6. alphabetic arranged in order according to the alphabet
  7. alphamerical of or pertaining to alphanumeric characters
  8. J particle a neutral meson with a large mass
  9. amphiprotic having characteristics of both an acid and a base and capable of reacting as either
  10. beta particle a high-speed electron or positron emitted in the decay of a radioactive isotope
  11. articulate express or state clearly
  12. psi particle a neutral meson with a large mass
  13. tau-plus particle an antilepton of very great mass
  14. particle (nontechnical usage) a tiny piece of anything
  15. alphabetize arrange in order from A to Z
  16. quasiparticle a quantum of energy (in a crystal lattice or other system) that has position and momentum and can in some respects be regarded as a particle
  17. lambda particle an electrically neutral baryon with isotopic spin 1
  18. alphabetise arrange in alphabetical order
  19. article one of a class of artifacts
  20. alphameric of or pertaining to alphanumeric characters