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| small triangular bone forming the lower extremity of the spinal column |
| compound ventral bone or cartilage that lies in the median central part of the body |
| false ribs | |
| —pl n | |
| See floating rib any of the lower five pairs of ribs in man, attached behind to the thoracic vertebrae but in front not attached directly to the breastbone | |
false rib n.
Any of the five pairs of lower ribs that do not articulate directly with the sternum.