What is Abator?

Legal Definition
Is, 1st, he who abates or prostrates a nuisance; 2, he who having no right of entry, gets possession of the freehold to the prejudiae of an heir or devisee, after the time when the ancestor died, and before the heir or devisee enters. See article Abatement. Litt. 897; Perk. 383; 1 Inst. 271; 2 Prest. Abst. 296. 300. As to the consequences of an abator dying in possession, See Adams' Eject. 43.
-- Bouviers Law Dictionary
Legal Definition
A person who takes a property before the heir has a chance to get the property.