ETYM French palissade, cf. Spanish palizada, Italian palizzata, palizzo, Late Lat. palissata; all from Latin palus a stake, pale. Related to Pale a stake.
1. A strong fence made of stakes driven into the ground; for defence.
2. Fence of stakes used for defensive purposes.

ETYM French estacade stockade, boom (confused in French with estocade.
A fence made of a line of stout posts set firmly for defense.