noun🔗ShareAn aircraft whose maximum speed is less than the speed of sound"The Boeing 737 is a well-known subsonic; it flies slower than the speed of sound. "vehiclemilitarytechnologysciencephysicsChat with AIVocabulary GamePractice Reading
adjective🔗Share(of a sound, scientific) having a frequency too low to be audible"The machine emitted a subsonic rumble that we could only feel, not hear. "soundphysicsfrequencyChat with AIVocabulary GamePractice Reading
adjective🔗Share(of a sound, literary) very quiet, almost inaudible"The noise of the ship was all around her. The faint subsonic rumble of the reactor and drive. (Leviathan Wakes, James S. A. Corey)"soundliteratureChat with AIVocabulary GamePractice Reading
adjective🔗Share(of a speed) less than the speed of sound (in the same medium, and at the same temperature and pressure)"The small plane flew at a comfortable, subsonic speed. "physicssoundtechnologyChat with AIVocabulary GamePractice Reading
adjective🔗Share(of a flow) with a Mach number such that 0.3 < Ma < 0.8 (approximately - the exact limits vary between sources)"The small airplane flew at a subsonic speed, much slower than a jet. "physicstechnicalsoundscienceChat with AIVocabulary GamePractice Reading
