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

Nearby words

  1. radioactinium,
  2. radioactivate,
  3. radioactive,
  4. radioactive constant,
  5. radioactive dating,
  6. radioactive fallout,
  7. radioactive iodine,
  8. radioactive isotope,
  9. radioactive series,
  10. radioactive tracer

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for rachio-



Spine; spinal:rachiometer.

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