I agree with Jeffrey. Went to Webster's and found this for "hydroscopic."

hydro[scope 7hj$dr! skbp#8 n. 5HYDRO- + -SCOPE6 a device like a periscope, for viewing things at some distance below the surface of water

And:

hygro[scopic 7hj#grb sk9p$ik,... Login to read more.