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rachio-

also rhachio-, before vowels rachi-, word-forming element meaning "spinal," from Greek rhakhis "spine, ridge, rib of a leaf." Cf. Greek rhakhos "thorn hedge."

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Online Etymology Dictionary, © 2010 Douglas Harper

rachio- in Medicine

rachio-

pref.
  1. Spine; spinal:rachiometer.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.