the GNU version of the Collaborative International Dictionary of English
adj. Of or pertaining to hygrometry; made with, or according to, the hygrometer.
adj. Readily absorbing and retaining moisture.
The Century Dictionary and Cyclopedia
Pertaining to hygrometry; relating to or depending upon the amount of moisture in the atmosphere.
Readily absorbing and retaining moisture: as, hygrometric substances or plants.
Word Usage
"Thus, for instance, two soils may be identical in composition, but one may be highly hygrometric, that is, may absorb moisture readily from the air, while the other may be very deficient in that property."