{ Ab″a‐tis, Aba″t‐tis, } (ăb″ȧ‐tĭs; French ȧ′bȧ′tē″) n. [F. abatis, abattis, mass of things beaten or cut down, fr. abattre. See Abate.] (Fort.) A means of defense formed by felled trees, the ends of whose branches are sharpened and directed outwards, or against the enemy.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.