a combining form meaning “marrow,” “of the spinal cord,” used in the formation of compound words: myelocyte.
Also especially before a vowel, myel-.
Origin of myelo-
combining form representing Greek myelós marrow
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
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
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.