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subsonic

[ suhb-son-ik ]
/ sʌbˈsɒn ɪk /
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adjective
noting or pertaining to a speed less than that of sound in air at the same height above sea level.

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Origin of subsonic

1940–45; sub- + sonic

OTHER WORDS FROM subsonic

sub·son·i·cal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use subsonic in a sentence

British Dictionary definitions for subsonic

subsonic
/ (sʌbˈsɒnɪk) /

adjective
being, having, or travelling at a velocity below that of sounda subsonic aircraft
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for subsonic

subsonic
[ sŭb-sŏnĭk ]

Having a speed less than that of sound in a designated medium, usually air; having a velocity less than Mach 1. Compare hypersonic supersonic transonic.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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