\Hy`gro*met"ric\, Hygrometrical \Hy`gro*met"ric*al\,
a. [Cf. F. hygrom['e]trique.]
1. Of or pertaining to hygrometry; made with, or according
   to, the hygrometer; as, hygrometric observations.
2. Readily absorbing and retaining moisture; as, hygrometric
   substances, like potash.