hygroscopicity|ˌhaɪgrəʊskəʊˈpɪsɪtɪ| [f. hygroscopic + -ity. In mod.F. hygroscopicité.] Hygroscopic quality. 1847Nat.Cycl. XI. 492 The hygroscopicity of vegetable tissue.1860All Year Round 389/2 The rotifers..are preserved..by the help of the hygroscopicity of the sand.