sorus

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

  1. noun a spore-producing structure in certain lichens and fungi
  2. noun cluster of sporangia usually on underside of a fern frond

Etymology

From New Latin sōrus, from Ancient Greek σωρός (sōrós, “heap”).

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