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

< Latin cost(a) rib (see costa) + -o- Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

costo- pref.
Rib: costovertebral.

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