It means to withdraw membership from an organization. ie: The south seceded from the union during the civil war.
The word is retreat.
Abolitionist
It was a term used for German nationals.
To withdraw membership from an alliance, federal union, political or religious organisation
secede
Phlebotomy, venipuncture
Aspirate
The term "pull out" means to withdraw from something. For example, in the sport of tennis, a player can "pull out" of a tournament because of injury.
of Withdraw
secede
secede
Venotomy, venesection, phlebotomy or venipuncture is piercing of a vein to withdraw blood. Venous cut-down is incision of a vein in an emergency to insert a tube to give fluids or other medications.
Rescind
Withdraw
I think you are trying to describe a Lumbar Puncture, which is performed in the lower (lumbar) region of the spine.
Praecipe is a legal term for an order.