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viscous (adj.)

late 14c., from Anglo-French viscous and directly from Late Latin viscosus "sticky," from Latin viscum "anything sticky, birdlime made from mistletoe, mistletoe," probably from PIE root *weis- "to melt away, flow" (used of foul or malodorous fluids); see virus.

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Definitions of viscous from WordNet

viscous (adj.)
having a relatively high resistance to flow;
Synonyms: syrupy
viscous (adj.)
having the sticky properties of an adhesive;
From wordnet.princeton.edu