- the large opening in the base of the skull forming the passage from the cranial cavity to the spinal canal.
Origin of foramen magnum
1880–85; < New Latin: literally, great hole
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- the large opening at the base of the skull through which the spinal cord passes
New Latin: large hole
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