We found 4 dictionaries that define the word red onions:

General (3 matching dictionaries)

1. red onions: Vocabulary.com
2. red onions: Wiktionary
3. Red onions: Wikipedia, the Free Encyclopedia

Art (1 matching dictionary)

4. Epicurus.com Food Glossary (No longer online)

(Note: See red_onion as well.)

Definitions from Wiktionary (red onion) ▸ noun:  A type of onion with reddish purplish skin. ▸ Also see red_onion ▸ Words similar to red onions ▸ Usage examples for red onions ▸ Idioms related to red onions ▸ Wikipedia articles (New!) ▸ Words that often appear near red onions ▸ Rhymes of red onions ▸ Invented words related to red onions