
The carpometacarpus is the fusion of the carpal and metacarpal bone, essentially a single fused bone between the wrist and the knuckles. It is a smallish bone in most birds, generally flattened and with a large hole in the middle. In flightless birds, however, its shape may be slightly different, or it might be absent entirely. It forms the tip of...
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http://en.wikipedia.org/wiki/Carpometacarpus

The largest bone of the manus of birds, formed by the fusion of some of the carpals (wrist bones) with the metacarpals (palm bones).
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https://academy.allaboutbirds.org/bird-academys-a-to-z-glossary-of-bird-ter
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