Definition of viscous adjective from the Oxford Advanced Learner's Dictionary

 

viscous

 adjective
adjective
BrE BrE//ˈvɪskəs//
 
; NAmE NAmE//ˈvɪskəs//
 
(specialist)
 
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(of a liquid) thick and sticky; not flowing freely Word Origin late Middle English: from Anglo-Norman French viscous or late Latin viscosus, from Latin viscum ‘birdlime’.
See the Oxford Advanced American Dictionary entry: viscous