Etymology

polymicrogyria

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Today it means: A deformity of the brain such that it has an excessive number of small folds, causing mental retardation. Full definition →

English gyrus ← Ancient Greek μῑκρο- (mīkro-) ← Proto-Indo-European *mey-der.?
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The story

  1. Proto-Indo-European*pleh₁-
  2. Proto-Indo-European*polh₁ús
  3. Ancient Greekπολῠ́ς (polŭ́s)
  4. Englishpoly-
  5. Proto-Indo-European*mey-der.?
  6. Ancient Greekμῑκρός (mīkrós)
  7. Ancient Greekμῑκρο- (mīkro-)
  8. Englishmicro-
  9. Englishgyrus
  10. English todaypolymicrogyria

From poly- + micro- + gyrus + -ia.

Etymology from Wiktionary, CC BY-SA 4.0.