noun. Surgical removal of the posterior arch of a vertebra.

noun. In surgery, exsection of the laminæ of one or more of the vertebræ to relieve pressure upon the spinal cord.

noun. The surgical procedure to remove the bony arch or lamina from one or more vertebrae.

noun. surgical removal of the bony arches on one or more vertebrae

"The surgical solution involves enlarging the opening to relieve the pressure on the nerves, in an operation called a laminectomy that costs $10,000 to $12,000."

ablation  cutting out  excision  extirpation  

rachiotomy