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abatis (n.)

"barricade defense made of felled trees with the branches angled outward," 1766, from French abatis, literally "things thrown down," from Old French abateiz "a casting down; slaughter, carnage" (12c.), from abatre "to beat down, throw down" (see abate).

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Definitions of abatis from WordNet

abatis (n.)
a line of defense consisting of a barrier of felled or live trees with branches (sharpened or with barbed wire entwined) pointed toward the enemy;
Synonyms: abattis
From wordnet.princeton.edu