pos

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

  1. noun a radioactive metallic element that is similar to tellurium and bismuth; occurs in uranium ores but can be produced by bombarding bismuth with neutrons in a nuclear reactor
  2. noun a noncommissioned officer in the Navy or Coast Guard with a rank comparable to sergeant in the Army
  3. noun a European river; flows into the Adriatic Sea

Synonyms

polonium, Po, atomic number 84

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