We found 15 dictionaries that define the word alkenes:

General (8 matching dictionaries)

1. alkenes: Merriam-Webster
2. alkenes: Collins English Dictionary
3. alkenes: Wordnik
4. alkenes: Cambridge Advanced Learner's Dictionary
5. alkenes: Wiktionary
6. alkenes: Dictionary.com
7. Alkenes: Wikipedia, the Free Encyclopedia
8. Alkenes: TheFreeDictionary.com

Computing (1 matching dictionary)

9. Alkenes: Encyclopedia

Medicine (4 matching dictionaries)

10. alkenes: Merriam-Webster Medical Dictionary
11. Medical Dictionary (No longer online)
12. online medical dictionary (No longer online)
13. Alkenes: Medical dictionary

Science (1 matching dictionary)

14. Chemistry Dictionary (No longer online)

Tech (1 matching dictionary)

15. Glossary of Meteorology (No longer online)

(Note: See alkene as well.)

Definitions from Wiktionary (alkene) ▸ noun:  (organic chemistry) An unsaturated, aliphatic hydrocarbon with one or more carbon–carbon double bonds. ▸ Also see alkene ▸ Words similar to alkenes ▸ Usage examples for alkenes ▸ Idioms related to alkenes ▸ Wikipedia articles (New!) ▸ Popular adjectives describing alkenes ▸ Words that often appear near alkenes ▸ Rhymes of alkenes ▸ Invented words related to alkenes