subsonic
adjective
No English definition recorded for this entry.
L340903 on Wikidata ↗Wiktionary
adj
Etymology: Etymology tree Proto-Indo-European *upó Proto-Italic *supo Latin sub Latin sub-der. English sub- Proto-Indo-European *swenh₂- Proto-Indo-European *swónh₂os Latin sonus Proto-Indo-European *-ikos Proto-Italic *-ikos Latin -icuslbor. Old French -iquebor. Middle English -ik English -ic English sonic English subsonic From sub- + sonic.
- having a frequency too low to be audible
- 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)”
- (aviation) less than the speed of sound (in the same medium, and at the same temperature and pressure)
“But British Airways Flight 112 made the trek in under five hours, setting a new record for the fastest subsonic commercial flight across the Atlantic Ocean.”
- with a Mach number such that 0.3 < Ma < 0.8 (approximately - the exact limits vary between sources)
noun
Etymology: Etymology tree Proto-Indo-European *upó Proto-Italic *supo Latin sub Latin sub-der. English sub- Proto-Indo-European *swenh₂- Proto-Indo-European *swónh₂os Latin sonus Proto-Indo-European *-ikos Proto-Italic *-ikos Latin -icuslbor. Old French -iquebor. Middle English -ik English -ic English sonic English subsonic From sub- + sonic.
- an aircraft whose maximum speed is less than the speed of sound