Submitted by György Chityil ... on Fri, 01/19/2018 - 22:19 Hierarchy: NounDescription: {{space science}} a nuclear-pulse rocket that uses fission-based atomic bombs to supply propulsive forceNgram: fission rocketNgram Text: fission rocketSource: WiktionaryIssue: 0Wiktionary tag: space scienceNgram Count: 2