Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Of, relating to, or being an auxiliary rocket on a multistage spacecraft that is fired in the direction of the spacecraft's motion to separate the sections.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[posi(tive) + (retro)grade.]

Examples

    Sorry, no example sentences found.

Comments

Log in or sign up to get involved in the conversation. It's quick and easy.