cas

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

  1. noun a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals
  2. noun a state in the western United States on the Pacific; the 3rd largest state; known for earthquakes

Synonyms

calcium, Ca, atomic number 20

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