Webster's English Dictionary

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viscous

vis.cous \'vis-k*s\ aj [ME viscouse, fr. LL viscosus full of birdlime, 
   viscous, fr. L v]iscum mistletoe, birdlime; akin to OHG wi-lsila cherry, Gk 
   ixos mistletoe 1: VISCID, GLUEY  2: having or characterized by viscosity  - 
   vis.cous.ly av