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costo-

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  1. a combining form meaning “rib,” used in the formation of compound words: costoclavicular.
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Also especially before a vowel, cost-.

Origin of costo-

< Latin cost(a) rib (see costa) + -o-
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

costo- in Medicine

costo-

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