We found 25 dictionaries that define the word hard core:

General (20 matching dictionaries)

1. hard-core, hard core: Merriam-Webster
2. hard core: Oxford Learner's Dictionaries
3. hard-core, hard core: American Heritage Dictionary of the English Language
4. hard core: Collins English Dictionary
5. hard-core, hard core: Vocabulary.com
6. Hard-Core, Hard-core, hard-core: Wordnik
7. hard-core, hard core: Cambridge Advanced Learner's Dictionary
8. hard-core: Wiktionary
9. hard-core (hardcore): The Wordsmyth English Dictionary-Thesaurus
10. hard core: Infoplease Dictionary
11. hard-core, hard core: Dictionary.com
12. hard-core: Cambridge Essential American English Dictionary
13. Hard Core (Lil' Kim album), Hard Core (Lil' Kim mixtape), Hard Core (Paul Dean album): Wikipedia, the Free Encyclopedia
14. hard-core, hard core: Rhymezone
15. hard-core, hard core: FreeDictionary.org
16. hard-core, hard core: Mnemonic Dictionary
17. hard-core, hard core: TheFreeDictionary.com
18. hard core: Longman Dictionary of Contemporary English

Business (2 matching dictionaries)

19. MoneyGlossary.com (No longer online)
20. hard-core, hard core: Legal dictionary

Computing (1 matching dictionary)

21. hard-core, hard core: Encyclopedia

Science (1 matching dictionary)

22. hard-core, hard core: PlanetMath Encyclopedia

Slang (1 matching dictionary)

23. hard-core, hard core: Urban Dictionary

(Note: See hard_coreing as well.)

Definitions from WordNet (hard core) ▸ noun:  the most dedicated and intensely loyal nucleus of a group or movement Phrases: Hard Core Logo, hard core criminal, hard core movie, more... ▸ Words similar to hard core ▸ Usage examples for hard core ▸ Idioms related to hard core ▸ Wikipedia articles (New!) ▸ Words that often appear near hard core ▸ Rhymes of hard core ▸ Invented words related to hard core