Abator is

ABATOR is, 1st, he who abates or prostrates a nuisance; 2, he who having no right of entry, gets possession of the freehold to the prejudice of an heir or devisee, after the time when the ancestor died, and before the heir or devisee enters. See article Abatement. Litt. Sec. 897; Perk. Sec. 383; 1 Inst. 271; 2 Prest. Abst. 296. 300. As to the consequences of an abator dying in possession, See Adams' Eject. 43.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.