Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “viscous”


adjective     /ˈvɪs.kəs/
describes a liquid that is thick and sticky and does not flow easily The state of matter viscosity     /vɪˈskɒs.ɪ.ti/ US  /-ˈskɑː.sə.t̬i/ noun [U] specializedMiddle Ages (medieval Period) 501-1500
(Definition of viscous adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of viscous

Definitions of “viscous” in other dictionaries

Word of the Day


the art and knowledge involved in preparing and eating good food

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