Etymology

subarachnoid

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Today it means: Located or occurring below the arachnoid mater, often specifically between the arachnoid membrane and the pia mater. Full definition →

English arachnoid ← Latin sub-
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The story

  1. Latinsub
  2. Latinsub-
  3. Englishsub-
  4. Englisharachnoid
  5. English todaysubarachnoid

From sub- + arachnoid.

Etymology from Wiktionary, CC BY-SA 4.0.