- Anatomy. pertaining to the ribs or the upper sides of the body: costal nerves.
- Botany, Zoology. pertaining to, involving, or situated near a costa.
Origin of costal
1625–35; < Medieval Latin costālis of the ribs, equivalent to Latin cost(a) rib, side + -ālis -al1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for costal
And, as Costal spoke, he drew his long knife to be ready for defending himself.
Costal, an Indian and a hunter, inhaled it with an instinctive delight.
As Costal said this, he rose from his seat, and glanced westward over the plain.
“Costal will not eat before to-morrow,” replied the negro in a grave tone.
Twelve times did Costal repeat the stroke, each time with equal force.
Word Origin and History for costal
"pertaining to the ribs," 1630s, from French costal (16c.), from Medieval Latin costalis, from costa "a rib" (see coast (n.)).
Online Etymology Dictionary, © 2010 Douglas Harper