subsonic

[ suhb-son-ik ]

adjective

1. noting or pertaining to a speed less than that of sound in air at the same height above sea level.
2. infrasonic.

subsonic

/ sʌbˈsɒnɪk /

adjective

1. being, having, or travelling at a velocity below that of sound

   a subsonic aircraft

subsonic

/ sŭb-sŏn′ĭk /

1. Having a speed less than that of sound in a designated medium, usually air; having a velocity less than Mach 1.
2. Compare hypersonic

Other Words From

• sub·soni·cal·ly adverb

Word History and Origins

Origin of subsonic¹

1940–45; sub- + sonic ( def )

Example Sentences

They presented records showing that Peterson, who lived in Durham, N.C., bought silencer components online and researched subsonic ammunition, which is quieter than standard rounds.

From Los Angeles Times

The venerable A-10, which first flew more than 50 years ago, is a single-seat, subsonic attack aircraft designed to provide close air support to ground troops by attacking enemy armored vehicles.

From Washington Times

A crane lifted the Intrepid’s Concorde onto a barge Wednesday for a very subsonic passage to the Brooklyn Navy Yard, where it will be stripped down, sanded and repainted.

From Seattle Times

Nuclear forces also are being modernized with $37.7 billion on new forces, and $11 billion for a mix of both hypersonic and long-range subsonic weapons that can strike from land, air and sea.

From Washington Times

Almost one-third of the Defense Department’s munitions dollars in the new budget would be focused on long-range weaponry — both hypersonic missiles and subsonic weapons.

From Washington Times