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[kos-tl, kaws-tl] /ˈkɒs tl, ˈkɔs 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.
Origin of costal
1625-35; < Medieval Latin costālis of the ribs, equivalent to Latin cost(a) rib, side + -ālis -al1
Related forms
costally, adverb
postcostal, adjective
precostal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for costal
Historical Examples
  • The costal pleura was covered with organized lymph to the thickness of an inch, with the usual characteristics.

    Cattle and Their Diseases Robert Jennings
  • As costal said this, he rose from his seat, and glanced westward over the plain.

    The Tiger Hunter Mayne Reid
  • The costal vein is not produced beyond the tip of the wing; radius with not more than three branches.

    Handbook of Medical Entomology William Albert Riley
  • And, as costal spoke, he drew his long knife to be ready for defending himself.

    The Tiger Hunter Mayne Reid
  • There are also three black spots on the front or costal margin, and the veins are black.

  • One of these was costal the Indian; the other was a stranger both to Morelos and the captain.

    The Tiger Hunter Mayne Reid
  • Its fore wings are brownish grey, crossed with zigzag darker lines, and having a black spot near the centre of the costal margin.

    Butterflies and Moths William S. Furneaux
  • In all these signs costal recognised the precursors of a storm.

    The Tiger Hunter Mayne Reid
  • costal and Clara were both seen to dive at the shot; and for a time Don Cornelio could not see either of them.

    The Tiger Hunter Mayne Reid
  • “The descendant of the caciques of Tehuantepec,” answered costal proudly.

    The Tiger Hunter Mayne Reid
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
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