Subcostal \Sub*cos"tal\, a. (Anat. & Zool.) Situated below the costas, or ribs; as, the subcostal muscles. [1913 Webster] Note: The subcostal muscles are distinct from, and within, the intercostal. [1913 Webster]
Subcostal \Sub*cos"tal\, n. 1. (Anat.) A subcostal muscle. [1913 Webster] 2. (Zool.) One of the principal nervures of the wings of an insect. It is situated next beneath or behind the costal. See {Nervure}. [1913 Webster]