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

"Contrary to the prevailing view that only a single steady-state solution exists for deflagration waves in subsonic one-dimensional systems, our approach posits an infinite number of such solutions as autoignitive reaction waves, asserting that ignition and flame are intrinsically linked," Morii said.

From Science Daily

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 house was littered with casings from subsonic ammunition of the same brand recovered from the motel room, Avila said.

From Los Angeles Times

A housekeeper found three live rounds of subsonic ammunition on the floor, along with blue latex gloves, Avila said.

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