Synonyms|3Antonyms|0|Broader|0Narrower|0Related|1
1
sound barrier
1
speed of sound(expression, idiom)
0
subsonic
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APASmart Define. (2015). subsonic speed thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/subsonic_speed/thesaurus/synonyms
ChicagoSmart Define. 2015. "subsonic speed thesaurus" https://smartdefine.org/subsonic_speed/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, subsonic speed thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/subsonic_speed/thesaurus/synonyms>.
MLASmart Define. "subsonic speed thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/subsonic_speed/thesaurus/synonyms>