| 单词 | retrorocket |
| 释义 | retrorocket /re"troh rok'it/, n. a small, auxiliary rocket engine, forming a part of a larger rocket vehicle and having its exhaust nozzle pointed toward the direction of flight, for decelerating the larger rocket, separating one stage from another, etc. Also, retro-rocket. [1945-50; RETRO- + ROCKET] |
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