retro-rocket noun. ['rɛtrǝʊrɒkɪt] M20.
[from RETRO- + ROCKET noun³.]
1. An anti-submarine rocket fired backwards with a velocity equal to that of the launching aircraft, so as to fall vertically. rare. Only in M20.

2. A forward-directed auxiliary rocket used to slow down a spacecraft etc., as when re-entering the earth's atmosphere. M20.

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