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1 A shield-shaped or rod-shaped bone in terrestrial vertebrates, on the ventral side of the thorax, that articulates with the clavicle (collar bone) of the pectoral girdle and with most of the ribs. It is absent in fish, and in birds it bears a keel.

2 The ventral portion of each segment of the exoskeleton of arthropods.

Subjects: Medicine and Health — Biological Sciences.

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