Etymology

foramen magnum

Today it means: The large foramen, or hole, in the occipital bone for the passage of the medulla oblongata and its membranes. Full definition →

Latin forāmen magnum
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The story

  1. Latin · borrowed fromforāmen magnum“big hole”
  2. English todayforamen magnum

From Latin forāmen magnum (“big hole”).

Etymology from Wiktionary, CC BY-SA 4.0.