Latent defect
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
A defect in an article sold, which is known to the seller, but not to the purchaser, and is not discoverable by mere observation.
See Hoe v. Sanborn, 21 N. Y. 552, 78 Am. Dec. 163.
So, a latent defect in the title of a vendor of land is one not discoverable by inspection made with ordinary care.
Newell v. Turner, 9 Port. (Ala.) 422