ESTOPPEL. A bar or impediment raised by the law, which precludes a man from alleging or from denying a certain fact or state of facts, In consequence of his previous allegation or denial or conduct or admission, or in consequence of a final adjudication of the matter in a court of law. Demarest v. Hopper, 22 N. J. Law, 619; Martin v. Railroad Co., 83 Me. 100, 21 Atl. 740; Veeder v. Mudgett, 95 N. Y. 285; South v. Deaton, 113