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foramen magnum

[mag-nuh m]
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noun Anatomy.
  1. the large opening in the base of the skull forming the passage from the cranial cavity to the spinal canal.
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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

British Dictionary definitions for foramen magnum

foramen magnum

noun
  1. the large opening at the base of the skull through which the spinal cord passes
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Word Origin

New Latin: large hole
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

foramen magnum in Medicine

foramen magnum

(măgnəm)
n.
  1. great foramen