furcula

1. A forked process or structure, generally two-pronged.

2. The forked bone formed by the fusion of the clavicles in birds, the wishbone or merrythought.

   a forked bone formed by the fusion of the clavicles of most birds

3. The (two-pronged) forked, somewhat tail-like organ held bent forward and secured by a catch beneath most species of Collembola (springtails), with which they jump by releasing the catch abruptly when alarmed.

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