We found 8 dictionaries that define the word cumulus clouds:

General (4 matching dictionaries)

1. cumulus clouds: Collins English Dictionary
2. cumulus clouds: Vocabulary.com
3. cumulus clouds: Dictionary.com
4. Cumulus Clouds: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)

5. Cumulus Clouds: Encyclopedia

Miscellaneous (1 matching dictionary)

6. Encyclopedia of Graphic Symbols (No longer online)

Science (1 matching dictionary)

7. Atmospheric Chemistry and Air Quality (No longer online)

Tech (1 matching dictionary)

8. Lake and Water Word Glossary (No longer online)

(Note: See cumulus_cloud as well.)

Definitions from Wikipedia (Cumulus cloud) ▸ noun:  Cumulus clouds are clouds that have flat bases and are often described as puffy, cotton-like, or fluffy in appearance. ▸ Also see cumulus_cloud ▸ Words similar to cumulus clouds ▸ Usage examples for cumulus clouds ▸ Idioms related to cumulus clouds ▸ Wikipedia articles (New!) ▸ Words that often appear near cumulus clouds ▸ Rhymes of cumulus clouds ▸ Invented words related to cumulus clouds