foramen magnum

noun Anatomy.
the large opening in the base of the skull forming the passage from the cranial cavity to the spinal canal.

1880–85; < Neo-Latin: literally, great hole Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
foramen magnum
the large opening at the base of the skull through which the spinal cord passes
[New Latin: large hole]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

foramen magnum foramen mag·num (māg'nəm)
See great foramen.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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