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• a  (of speed) less than that of sound in a designated medium
  aircraft flying at subsonic speeds

• In a rare lapse of vision, Trippe thought the 747 would be superseded by a big supersonic jet, as cheap to run as a subsonic jet.
• The Navy argued hard for a subsonic nuclear turboprop seaplane for antisubmarine warfare and long-range radar-warning patrol.
• Long range, subsonic cruise missile used for land attack warfare.

• sonic

News & Articles

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• Rolling Airframe Missile Block 2 completes initial fleet firing
  Tucson AZ (SPX) Aug 09, 2013 The U.S. Navy completed the first fleet firing of Raytheon's Rolling Airframe Missile Block 2 as part of its ongoing developmental and operational testing (DT/OT). In an at-sea test conducted from the USS Arlington (LPD 24), two RAM Block 2 missiles engaged a subsonic target in a scenario designed to demonstrate the advanced missile's defensive capabilities. This ...
  Aug. 9, 2013 - Space War

Quotes

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• Jamie Baulch in ic Wales
  Jamie said, "We had a few scary moments and a couple that could have been deadly. They are very intelligent creatures and they hear through the ground, in a subsonic way. We were walking towards them and the next thing we knew, there was another...