We found 17 dictionaries that define the word at heart:

General (15 matching dictionaries)

1. at heart: Merriam-Webster
2. at heart: Oxford Learner's Dictionaries
3. at heart: Collins English Dictionary
4. at heart: Vocabulary.com
5. at heart: Wordnik
6. at heart: Wiktionary
7. At heart, at heart: Dictionary.com
8. At Heart: Wikipedia, the Free Encyclopedia
9. at heart: Rhymezone
10. at heart: FreeDictionary.org
11. at heart: Mnemonic Dictionary
12. at heart: TheFreeDictionary.com
13. at heart: Longman Dictionary of Contemporary English

Medicine (1 matching dictionary)

14. at heart: Merriam-Webster Medical Dictionary

Miscellaneous (1 matching dictionary)

15. at heart: Idioms

Definitions from Wikipedia (At Heart) ▸ noun:  the third studio album by American metalcore band Miss May I. Opposite: superficially, on surface, outwardly Phrases: young at heart, sick at heart, to have at heart, to lie at the heart, Sisters at Heart, more... ▸ Words similar to at heart ▸ Usage examples for at heart ▸ Idioms related to at heart ▸ Wikipedia articles (New!) ▸ Words that often appear near at heart ▸ Rhymes of at heart ▸ Invented words related to at heart