Multidomain crystals of CsCd(NO,), grown from aqueous solutions at about 310 K exhibit a quasi-cubic symmetry in their thermal expansion, elastic and thermoelastic properties. The elastic constants of the low-temperature multidomain state resemble the behaviour of stable cubic perovskites almost quantitatively. This suggests that the trigonal low-temperature phase of CsCd(NO,), possesses a quasi-cubic symmetry. The transition from the trigonal low-temperature phase into the cubic high-temperature phase at about 464 K is accompanied by a small deformation of about and a lambda-type variation of the thermal expansion.