The Kindle's Oxford dictionaries are truly excellent and certainly have "palisade" in them
From the Kindle:
1. A fence of wooden stakes or iron railings fixed in the ground, forming an enclosure or defence.
2. Palisades (US). A line of high cliffs.
v (with obj)(usually as adj palisaded) enclose or provide (a building or place) with a palisade.
ORIGIN Early 17th century: from French palissada, from palissa "paling", based on Latin palus "stake".