We found 29 dictionaries that define the word days:

General (21 matching dictionaries)

1. days: Merriam-Webster
2. days: Oxford Learner's Dictionaries
3. days: American Heritage Dictionary of the English Language
4. days: Collins English Dictionary
5. days: Vocabulary.com
6. Day's, Days, Days, day's, days, days, days: Wordnik
7. days, the days: Cambridge Advanced Learner's Dictionary
8. days: Wiktionary
9. days: Webster's New World College Dictionary, 4th Ed.
10. days: The Wordsmyth English Dictionary-Thesaurus
11. days: Infoplease Dictionary
12. days: Dictionary.com
13. days: Cambridge Essential American English Dictionary
14. Days (Flow song), Days (High and Mighty Color song), Days (Kinks song), Days (Ray Davies song), Days (The Kinks song), Days (album), Days (film), Days (manga), Days (surname), Days, The Days (Avicii song), The Days (TV series), The Days (band), The Days (book), The Days (film), The Days (song), The Days: Wikipedia, the Free Encyclopedia
15. DAYS: Stammtisch Beau Fleuve Acronyms
16. days: FreeDictionary.org
17. days: Mnemonic Dictionary
18. days: TheFreeDictionary.com
19. days: Wikimedia Commons US English Pronunciations
20. days: Rhymezone
21. days: Wordnik

Business (1 matching dictionary)

22. days: Legal dictionary

Computing (1 matching dictionary)

23. days: Encyclopedia

Medicine (1 matching dictionary)

24. days: Medical dictionary

Miscellaneous (3 matching dictionaries)

25. DAYS: Acronym Finder
26. AbbreviationZ (No longer online)
27. days: Idioms

Slang (2 matching dictionaries)

28. days: Green’s Dictionary of Slang
29. days, the days: Urban Dictionary

(Note: See day as well.)

Definitions from Wiktionary (days) ▸ noun:  A particular time or period of vague extent. ▸ noun:  Life. ▸ adverb:  During the day. Similar: years, Weeks, months, hours, nights, times, weekends, minutes, decade, period, more... Opposite: nights, evenings, darkness, nighttime, dusk Types: weekday, weekend, holiday, vacation, day off, more... Phrases: the days, two days, three days, those days, these days, more... Adjectives: few, several, early, last, first, old, next, past, former, happy, consecutive Colors:     blue,     yellow,     red,     green,     orange, more... ▸ Words similar to days ▸ Usage examples for days ▸ Idioms related to days ▸ Wikipedia articles (New!) ▸ Popular adjectives describing days ▸ Words that often appear near days ▸ Rhymes of days ▸ Invented words related to days