Webster's English Dictionary

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hygroscopic

hy.gro.scop.ic \.hi--gr*-'ska:p-ik\ \-i-k(*-)le-\ \-(.)ska:p-'is-*t-e-\ aj 
   [fr. the use of such materials in the hygroscope] 1: readily taking up and 
   retaining moisture  2: involving or induced by the taking up of moisture  - 
   hy.gro.scop.i.cal.ly av