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a combining form meaning “marrow,” “of the spinal cord,” used in the formation of compound words:
Also, especially before a vowel, myel-.
Origin of myelo-
combining form representing Greek myelós marrow Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Word Origin and History for myelo-

before vowels myel-, word-forming element meaning "marrow, spinal cord," from Greek myelos "marrow; the brain," of unknown origin.

Online Etymology Dictionary, © 2010 Douglas Harper
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myelo- in Medicine

myelo- or myel-

  1. Spinal cord: myelitis.

  2. Bone marrow: myeloma.

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