Modifies a noun

• aircraft: Subsonic aircraft have been measured at twice the legal noise level, struggling to take off with heavy loads in adverse conditions.

• jet: At the same time there were 1,941 infringements by subsonic jets.

• speed: The barrel was short and the bullet emerged at subsonic speed.

• flow: It is concluded that the present method is accurate for quantitative predictions of unsteady heat transfer in subsonic turbine flows.

• velocity: A pinch of the proper powder pushes this bullet out the muzzle at subsonic velocities, thus permitting silent fire.

• filter: Racks are subsonic filters and should really be thought of as an essential component in any Stereo or Home Cinema system.

Modifying Another Word

• wholly: The method is applicable for subsonic flight speeds when the flow over the aircraft is wholly subsonic and fully attached.