Citations:retroes

Noun: plural of retro (sense: retrorocket)

 * 1959, Society of Experimental Test Pilots, Quarterly Review - Society of Experimental Test Pilots, Volume 4, page 67
 * The ability to impact within a prescribed area is a function of proper retro firing timing and firing retroes in a proper attitude.
 * 1980, Analog Science Fiction/science Fact, Volume 100, Issues 4-6, Davis Publications, page 93
 * Retroes fired, the shuttle slowed.

Noun: plural of retro (unknown sense of retro)

 * 1922, The British Chess Magazine - Volume 42, published by Trubner & Company, page 370
 * Composers may enter by the 31st October next, any number of direct problems in any number of moves, self-mates, self-stalemates, help-mates, retroes, retractors, etc., but the conditions for the unorthodox entries must be clearly indicated.