as

Reading level: easy

Estimated CEFR level: A1 — Beginner

Estimated from word frequency; not an official CEFR classification.

Definition

  1. noun a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and various alloys; found in arsenopyrite and orpiment and realgar
  2. noun a United States territory on the eastern part of the island of Samoa
  3. noun a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation

Etymology

From Middle English as, als(a), alswa, from Old English eallswā (“just so; as”), thus representing a reduced form of also. Compare German Low German a(l)s, German als, Dutch als.

In classic literature

Synonyms

arsenic, atomic number 33

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