palisad

n. [ F. palissade, cf. Sp. palizada, It. palizzata, palizzo, LL. palissata; all fr. L. palus a stake, pale. See Pale a stake. ] 1. (Fort.) A strong, long stake, one end of which is set firmly in the ground, and the other is sharpened; also, a fence formed of such stakes set in the ground as a means of defense. [ 1913 Webster ]

2. Any fence made of pales or sharp stakes. [ 1913 Webster ]

3. A line of bold cliffs, esp. one showing basaltic columns; -- usually in pl., and orig. used as the name of the cliffs on the west bank of the lower Hudson. [ Webster 1913 Suppl. ]

Palisade cells (Bot.), vertically elongated parenchyma cells, such as are seen beneath the epidermis of the upper surface of many leaves. --
Palisade worm (Zool.), a nematoid worm (Strongylus armatus), parasitic in the blood vessels of the horse, in which it produces aneurisms, often fatal. [ 1913 Webster ]