Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “viscous”


adjective uk   /ˈvɪs.kəs/ us  
describes a liquid that is thick and sticky and does not flow easilyThe state of matter
noun [U] uk   /vɪˈskɒs.ɪ.ti/ us    /-ˈskɑː.sə.t̬i/ specialized
Middle Ages (medieval Period) 501-1500
(Definition of viscous from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of viscous?
Add Cambridge dictionaries to your browser to your website

Definitions of “viscous” in other dictionaries

Word of the Day


to throw or drop something carelessly

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More