[kos-tl, kaws-tl]
Anatomy. pertaining to the ribs or the upper sides of the body: costal nerves.
Botany, Zoology. pertaining to, involving, or situated near a costa.

1625–35; < Medieval Latin costālis of the ribs, equivalent to Latin cost(a) rib, side + -ālis -al1

costally, adverb
postcostal, adjective
precostal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
costa (ˈkɒstə)
n , pl -tae
1.  the technical name for rib
2.  a riblike part, such as the midrib of a plant leaf
[C19: from Latin: rib, side, wall]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"pertaining to the ribs," 1630s, from Fr. costal, from Mod.L. costalis, from costa "a rib."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Articular cartilage, costal cartilage, and temporary cartilage are all of the hyaline variety.
Between it and the inferior border is a groove, the costal groove, for the intercostal vessels and nerve.
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