acnestis|ækˈniːstɪs| [mod.L., a. Gr. ἄκνηστις spine, backbone.] That part of the back between the shoulder-blade and the loins which an animal cannot reach to scratch. 1807in Edin.Med. & Phys.Dict. II. Suppl.1927Observer 3 Apr., That spot known to crossword solvers as the acnestis.