We found 22 dictionaries that define the word opsin:

General (15 matching dictionaries)

1. opsin: Merriam-Webster
2. opsin: Oxford Learner's Dictionaries
3. opsin: American Heritage Dictionary of the English Language
4. opsin: Collins English Dictionary
5. opsin: Vocabulary.com
6. opsin: Wordnik
7. opsin: Wiktionary
8. opsin: Webster's New World College Dictionary, 4th Ed.
9. opsin: Infoplease Dictionary
10. opsin: Dictionary.com
11. Opsin: Wikipedia, the Free Encyclopedia
12. opsin: Rhymezone
13. opsin: FreeDictionary.org
14. opsin: Mnemonic Dictionary
15. opsin: TheFreeDictionary.com

Computing (1 matching dictionary)

16. opsin: Encyclopedia

Medicine (5 matching dictionaries)

17. opsin: Merriam-Webster Medical Dictionary
18. Medical Dictionary (No longer online)
19. online medical dictionary (No longer online)
20. Opsin: Visionary
21. opsin: Medical dictionary

Science (1 matching dictionary)

22. Visionary, for the Study of Vision (No longer online)

(Note: See opsins as well.)

Definitions from Wiktionary (opsin) ▸ noun:  (biochemistry) Any of a group of light-sensitive proteins in the retina. Similar: peropsin, rhodopsin, photopsin, bacterioopsin, conopsin, channelopsin, pinopsin, xenopsin, parapinopsin, iodopsin, more... Phrases: cone opsin, Nipson anomemata me monan opsin, more... Adjectives: blue, free, retinylidene, human, novel, same, retinal, different, green, red, immunoreactive ▸ Words similar to opsin ▸ Usage examples for opsin ▸ Idioms related to opsin ▸ Wikipedia articles (New!) ▸ Popular adjectives describing opsin ▸ Words that often appear near opsin ▸ Rhymes of opsin ▸ Invented words related to opsin