We found 6 dictionaries that define the word swelled-headed:

General (4 matching dictionaries)

1. swelled-headed: Merriam-Webster
2. swelled-headed, swelled-headed: Collins English Dictionary
3. swelled-headed: Dictionary.com
4. swelled-headed: TheFreeDictionary.com

Medicine (1 matching dictionary)

5. swelled-headed: Merriam-Webster Medical Dictionary

Slang (1 matching dictionary)

6. swelled-headed: Green’s Dictionary of Slang

(Note: See swelled_head as well.)

Definitions from Wiktionary (swelled head) ▸ noun:  (informal) Self-conceit. ▸ Also see swelled_head ▸ Words similar to swelled-headed ▸ Usage examples for swelled-headed ▸ Idioms related to swelled-headed ▸ Wikipedia articles (New!) ▸ Popular adjectives describing swelled-headed ▸ Words that often appear near swelled-headed ▸ Rhymes of swelled-headed ▸ Invented words related to swelled-headed