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There are 2 five-letter words beginning with ONIU

onium -onium

5 definitions found

  • onium — n. (Chemistry) any cation derived by the addition of a proton… — n. (Chemistry) any organic derivative of these compounds. — n. (Physics) the bound pair of a particle and its antiparticle.
  • -onium — suff. (Physics) Designating an onium particle. — suff. (Pharmacology) Used to form names of quaternary ammonium…
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