po

Reading level: hard

Estimated CEFR level: C1 — Advanced

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

Etymology

From Middle English po (found also in pocock), from Old English pāwa, pēa (“peacock”), from Proto-Germanic *pāwô (“peacock”), from Latin pāvō. Cognate with Dutch pauw, German Pfau. See also peacock.

In classic literature

Synonyms

polonium, atomic number 84

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