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OTHER WORDS FROM subsonicsub·son·i·cal·ly, adverb
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Atoms going around 62 miles per second come from the inner heliosheath, where the solar wind becomes subsonic as it hits against the interstellar medium.The Safety Belt of Our Solar System - Issue 107: The Edge|Virat Markandeya|October 6, 2021|Nautilus
These airplanes are expected to seat 65 to 88 passengers and will travel at subsonic speeds over land and supersonic speeds over water—more than twice as fast as current commercial aircraft.Meet the XB-1: A prototype for a modern supersonic passenger jet|Eric Berger|October 7, 2020|Ars Technica
From below came a vibrational rushing noise, nearly subsonic, which told him of the fueling operation.Tight Squeeze|Dean Charles Ing
A wave of some sort—probably subsonic or supersonic—continuously filled the Vininese atmosphere.The Instant of Now|Irving E. Cox, Jr.