One of the mysteries of the English language finally explained.
1Zoology. Of a fish: having ventral fins below the pectorals. Of ventral fins: below the pectorals. Now rare.
2Anatomy and Zoology. Located below, or on the underside of, the forelimb or arm.
3Anatomy. Located below a brachium (arm-like structure) of the brain.
Mid 19th century; earliest use found in Encyclopedia Americana. From post-classical Latin subbrachialis under the arm from classical Latin sub- + brachiālis.
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