subsonic

English

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 *-kos

Proto-Indo-European *-ikos

Proto-Italic *-ikos

Latin -icuslbor.

Old French -iquebor.

Middle English -ik

English -ic

English sonic

English subsonic

From sub- + sonic.

Pronunciation

• Audio (Southern England):

  (file)

  Rhymes: -ɒnɪk

Adjective

subsonic (not comparable)

1. (of a sound, scientific) having a frequency too low to be audible
2. (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)

3. (of a speed) (aviation) less than the speed of sound (in the same medium, and at the same temperature and pressure)
   • 2020 February 9, Alina Selyukh, “British Airways Sets Record, Crossing The Atlantic In Under 5 Hours In Strong Winds”, in NPR:

     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.

4. (fluid mechanics, of a flow) with a Mach number such that 0.3 < Ma < 0.8 (approximately - the exact limits vary between sources)

Derived terms

• subsonically

Related terms

• hypersonic
• plasmasonic
• supersonic
• transonic

Translations

(of a speed) less than the speed of sound

• Bulgarian: дозвукова (скорост) (dozvukova (skorost))
• Chinese:

  Mandarin: 次音速 (cìyīnsù)

• Czech: podzvukový (cs), subsonický (cs)
• Dutch: subsonisch (nl)
• Finnish: ääntä hitaampi, aliääni-, aliääninen, aliääninopeuksinen
• French: subsonique (fr)
• Greek: υποηχητικός (el) (ypoïchitikós)
• Irish: foshonach
• Italian: subsonico (it)
• Lithuanian: ikigarsinis
• Polish: poddźwiękowy (pl)
• Portuguese: subsónico (Portugal), subsônico (Brazil)
• Romanian: subsonic (ro)
• Russian: дозвуково́й (ru) (dozvukovój)
• Spanish: subsónico (es)
• Swedish: subsonisk, underljuds-
• Tagalog: kubnugin

Noun

subsonic (plural subsonics)

1. an aircraft whose maximum speed is less than the speed of sound

Romanian

Etymology

Borrowed from French subsonique.

Pronunciation

• IPA^(key): /subˈso.nik/

Adjective

subsonic m or n (feminine singular subsonică, masculine plural subsonici, feminine/neuter plural subsonice)

1. subsonic

   Synonym: subacustic

   Antonym: hipersonic

Declension

Declension of subsonic

		singular			plural
		masculine	neuter	feminine	masculine	neuter	feminine
nominative- accusative	indefinite	subsonic		subsonică	subsonici	subsonice
	definite	subsonicul		subsonica	subsonicii	subsonicele
genitive- dative	indefinite	subsonic		subsonice	subsonici	subsonice
	definite	subsonicului		subsonicei	subsonicilor	subsonicelor