RhymeZone: subcostal definitions

Definitions of subcostal:

adjective: (anatomy) Below a rib or the ribs.
adjective: (entomology) Pertaining to the subcosta and/or the area of the wing next to it.
noun: (anatomy) A subcostal muscle.
noun: (zoology) One of the principal nervures of the wings of an insect. It is situated next beneath or behind the costal.

(Definitions from Wiktionary)