1. (n.) One of the serial segments of the spinal column.

2. (n.) One of the central ossicles in each joint of the arms of an ophiuran.

adamant aitchbone anklebone anvil backbone bill biscuit bony breastbone brick buck calcaneus cannon bone carpal cartilage cement chine clavicle coccyx collarbone con concrete contemplate cracker cranium cubes cuboid diamond dice dig drill dust elucubrate examine fibula fish flint frogskin funny bone go over granite grind hammer heart of oak hyoid bone incus iron ivory jawbone kneecap ligament lucubrate malleus mandible marble maxilla maxillary metacarpal metatarsal mummy nails nasal bone oak occipital bone osseous ossicle ossicular ossiferous ossified osteal parchment patella pelvis peruse phalanges phalanx plunge into pore over practice pubis rachidial rachis radius read regard studiously restudy review rib rock sacrum scaphoid scapula sesamoid bones shinbone shoulder blade skin skull smacker sphenoid spinal column spine stapes steel sternum stick stirrup stone study swot talus tarsus temporal bone tendon thighbone ulna vertebra vertebral column vet wade through wishbone wristbone zygomatic bone