subsonic
adjective, noun
Forms subsonics
- adjective (of a sound, scientific) having a frequency too low to be audible
- adjective (of a sound, literary) very quiet, almost inaudible
- adjective (of a speed) (aviation) less than the speed of sound (in the same medium, and at the same temperature and pressure)
- adjective (fluid mechanics, of a flow) with a Mach number such that 0.3 < Ma < 0.8 (approximately - the exact limits vary between sources)
- noun an aircraft whose maximum speed is less than the speed of sound
Antonyms
Sources: Wiktionary · WordNet 3.0 — from the Wiktionary entry “subsonic”, CC BY-SA 4.0. Details