We found 3 dictionaries that define the word third-raters:

General (3 matching dictionaries)

1. third-raters: Merriam-Webster
2. third-raters, third-raters: Collins English Dictionary
3. third-raters: TheFreeDictionary.com

(Note: See third-rater as well.)

Definitions from WordNet (third-rater) ▸ noun:  one who is third-rate or distinctly inferior ▸ Also see third-rater ▸ Words similar to third-raters ▸ Usage examples for third-raters ▸ Idioms related to third-raters ▸ Wikipedia articles (New!) ▸ Popular adjectives describing third-raters ▸ Words that often appear near third-raters ▸ Rhymes of third-raters ▸ Invented words related to third-raters