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costo-

1.
a combining form meaning “rib,” used in the formation of compound words:
costoclavicular.
Also, especially before a vowel, cost-.
Origin
< Latin cost(a) rib (see costa) + -o-
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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costo- in Medicine

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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