We found 2 dictionaries that define the word booster rockets:

General (2 matching dictionaries)

1. booster rockets: Merriam-Webster
2. booster rockets: Collins English Dictionary

(Note: See booster_rocket as well.)

Definitions from WordNet (booster rocket) ▸ noun:  the first stage of a multistage rocket ▸ Also see booster_rocket ▸ Words similar to booster rockets ▸ Usage examples for booster rockets ▸ Idioms related to booster rockets ▸ Wikipedia articles (New!) ▸ Words that often appear near booster rockets ▸ Rhymes of booster rockets ▸ Invented words related to booster rockets