1) Surgical removal procedure 
A laminotomy is an orthopaedic neurosurgical procedure that removes part of a lamina of the vertebral arch in order to decompress the corresponding spinal cord and/or spinal nerve root. This was originally performed as a hemilaminectomy, consisting in the removal of either the left or right half of the lamina, but is now more commonly carried out ...
An opening made in a lamina.
<procedure> An operation on one or more vertebral laminae. ... Synonym: rachiotomy. ... Origin: L. Lamina, layer, + G. Tome, incision ... (05 Mar 2000) ... 
(lam″ĭ-not´ә-me) transection of a vertebral lamina.
Type: Term Pronunciation: lam-i-not′ŏ-mē Definitions: 1. Excision of a portion of a vertebral lamina resulting in enlargement of the intervertebral foramen for the purpose of relieving pressure in a spinal nerve root. Synonyms: rachiotomy
A laminotomy is a procedure in which an opening is made in a lamina to approach the intervertebral disc or neural structures.