beryllium

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

  1. noun a light strong brittle grey toxic bivalent metallic element

Etymology

From beryl + -ium, so called because the element is a key component of the mineral beryl.

In classic literature

Synonyms

Be, glucinium, atomic number 4

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