n ambiguity with regards to ab muscles foundation of the tool itself, as distinguished from an ambiguity in regard to the construction of its terms. The term is applied, for example, to any doubt as to whether a testator meant a specific term to-be an integral part of the might, or whether it had been introduced together with his knowledge, or whether a codicil was designed to republish a former will, or whether or not the residuary clause had been accidentally omitted. Fatherly v. Fatherly, We Cool. (Tenn.) 461, 465, 78 Am. Dec. 499.