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From The Collaborative International Dictionary of English v.0.48:
Viscous \Vis"cous\, a. [L. viscosus. See Viscid.] Adhesive or sticky, and having a ropy or glutinous consistency; viscid; glutinous; clammy; tenacious; as, a viscous juice. -- Vis"cous*ness, n. [1913 Webster] Note: There is no well-defined distinction in meaning between viscous and viscid. [1913 Webster]