verb transitiveWord forms: ˈretroˌfired or ˈretroˌfiring
2. to become ignitedsaid of a retrorocket
3. the igniting of a retrorocket
Webster’s New World College Dictionary, Fourth Edition, compiled by the
editors of Webster’s New World Dictionaries. Copyright © 2010 by Houghton
Mifflin Harcourt. Published by Houghton Mifflin Harcourt. All rights reserved.