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| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| spinal column | |
| —n | |
| spine, vertebral column, Also called: rachis, Nontechnical name: backbone a series of contiguous or interconnecting bony or cartilaginous segments that surround and protect the spinal cord | |
spinal column n.
The series of articulated vertebrae, separated by intervertebral disks and held together by muscles and tendons, that extends from the cranium to the coccyx, encasing the spinal cord and forming the supporting axis of the body. Also called backbone, rachis, spine, vertebral column.
| spinal column (spī'nəl) Pronunciation Key
See vertebral column. |