One of the mysteries of the English language finally explained.
In most bony fishes: each of one or more bones forming the posterior part of the pectoral girdle, lying behind, and partly overlapped by, the cleithrum, and having a spine projecting downwards into the muscles of the body wall.
Late 19th century; earliest use found in Theodore Gill (1837–1914). From post- + clavicle.
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