We found 3 dictionaries that define the word red spiders:

General (3 matching dictionaries)

1. red spiders: Merriam-Webster
2. red spiders: Collins English Dictionary
3. red spiders: Vocabulary.com

(Note: See red_spider as well.)

Definitions from WordNet (red spider) ▸ noun:  small web-spinning mite; a serious orchard pest ▸ Also see red_spider ▸ Words similar to red spiders ▸ Usage examples for red spiders ▸ Idioms related to red spiders ▸ Wikipedia articles (New!) ▸ Words that often appear near red spiders ▸ Rhymes of red spiders ▸ Invented words related to red spiders