One of the mysteries of the English language finally explained.
More fully "subclavius muscle". A muscle which (in humans) originates from the first costal cartilage and inserts on to the undersurface of the clavicle, acting to elevate the first rib or fix the clavicle.
Early 17th century; earliest use found in Helkiah Crooke (1576–1648), physician and anatomist. From post-classical Latin subclavius, use as noun (short for subclavius musculus) of subclavius, adjective.
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