io

Reading level: hard

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

  1. noun (Greek mythology) a maiden seduced by Zeus; when Hera was about to discover them together Zeus turned her into a white heifer
  2. noun the closest of Jupiter's moons; has active volcanoes

Etymology

From New Latin, from Ancient Greek Ἰώ (Iṓ, “Io”).

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