• Webster's Revised Unabridged Dictionary
    • Subcostal (Anat) A subcostal muscle.
    • Subcostal (Zoöl) One of the principal nervures of the wings of an insect. It is situated next beneath or behind the costal. See Nervure.
    • a Subcostal (Anat. & Zoöl) Situated below the costas, or ribs; as, the subcostal muscles.☞ The subcostal muscles are distinct from, and within, the intercostal.
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Century Dictionary and Cyclopedia
    • subcostal In anatomy and zoology: Situated below a rib; extending from one rib to a succeeding one; infracostal: specifically noting the muscles called subcostales.
    • subcostal Lying along the under side or edge of a rib: as, a subcostal groove for an artery.
    • subcostal Placed under or within the ribs or costal cartilages collectively; hypochondrial; subcartilaginous.
    • subcostal In entomology, situated near, but not at or on, the costa: specifically noting the subcostal.
    • n subcostal In zoology and anatomy: A subcostal or infracostal muscle. See subcostalis.
    • n subcostal A subcostal artery, vein, or nerve, running along the groove in the lower border of a rib; an intercostal.
    • n subcostal In entomology, a subcostal vein or nervure; the subcosta.
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Chambers's Twentieth Century Dictionary
    • adj Subcostal sub-kos′tal under or between the ribs.
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In literature:

Subcostal cell: in Diptera (Schiner), = marginal cell (Loew), = radial 1 (Comst.
"Explanation of Terms Used in Entomology" by John. B. Smith
The last thoracic or subcostal nerves pass behind the external arcuate ligament.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4" by Various
Below the last rib a subcostal artery runs.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 6" by Various