pr

Reading level: hard

Estimated CEFR level: C1 — Advanced

Estimated from word frequency; not an official CEFR classification.

Definition

  1. noun a soft yellowish-white trivalent metallic element of the rare earth group; can be recovered from bastnasite or monazite by an ion-exchange process
  2. noun a self-governing commonwealth associated with the United States occupying the island of Puerto Rico
  3. noun a promotion intended to create goodwill for a person or institution

In classic literature

Synonyms

praseodymium, atomic number 59

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