cumulusnoun [ U ]uk /ˈkjuː.mjə.ləs/ us /ˈkjuː.mjə.ləs/ specialized
- Cumulus and cirrus clouds are white.
- Cumulus clouds are big and fluffy. Cirrus clouds are very thin and long.
(Definition of “cumulus” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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a group of people, especially within a political party, who try to encourage other people to follow a new, more interesting, or more active way of doing things