We found 24 dictionaries that define the word hygroscope:

General (19 matching dictionaries)

1. hygroscope: Oxford Learner's Dictionaries
2. hygroscope: American Heritage Dictionary of the English Language
3. hygroscope: Collins English Dictionary
4. hygroscope: Vocabulary.com
5. hygroscope: Wordnik
6. hygroscope: Wiktionary
7. hygroscope: Webster's New World College Dictionary, 4th Ed.
8. hygroscope: The Wordsmyth English Dictionary-Thesaurus
9. hygroscope: Infoplease Dictionary
10. hygroscope: Dictionary.com
11. Hygroscope: Online Plain Text English Dictionary
12. hygroscope: Webster's Revised Unabridged, 1913 Edition
13. hygroscope: Rhymezone
14. Hygroscope: AllWords.com Multi-Lingual Dictionary
15. hygroscope: Webster's 1828 Dictionary
16. hygroscope: FreeDictionary.org
17. hygroscope: The Phrontistery - A Dictionary of Obscure Words
18. hygroscope: Mnemonic Dictionary
19. hygroscope: TheFreeDictionary.com

Computing (1 matching dictionary)

20. hygroscope: Encyclopedia

Medicine (2 matching dictionaries)

21. hygroscope: Merriam-Webster Medical Dictionary
22. online medical dictionary (No longer online)

Tech (2 matching dictionaries)

23. Glossary of Meteorology (No longer online)
24. Lake and Water Word Glossary (No longer online)

(Note: See hygroscopes as well.)

Definitions from Wiktionary (hygroscope) ▸ noun:  An instrument that indicates changes in atmospheric humidity Similar: hygrometer, hygrograph, hygrometre, hygrostat, hypsometer, hygristor, hygrography, hydrometre, hydrometer, hydropletismometer, more... Types: hair hygrometer, psychrometer, sling psychrometer, more... ▸ Words similar to hygroscope ▸ Usage examples for hygroscope ▸ Idioms related to hygroscope ▸ Wikipedia articles (New!) ▸ Popular adjectives describing hygroscope ▸ Words that often appear near hygroscope ▸ Rhymes of hygroscope ▸ Invented words related to hygroscope