subsonic

Fetched 2026-10-26 (cache).

Synonyms: subtonic, subconic, bubonic, subsolid, subtunic, subsoil, sulfonic, subtopic, subsong

Antonyms: subtonic, subconic, bubonic, subsolid, subtunic, subsoil, sulfonic, subtopic, subsong

Related words from Datamuse; suggestions, not definitions.

Adjective

1. {{lb|en|of a sound, scientific}} having a [[frequency]] too low to be [[audible]]
2. {{lb|en|of a sound, literary}} very quiet, almost inaudible
3. {{lb|en|of a speed}} {{lb|en|aviation}} less than the [[speed of sound]] (in the same [[medium]], and at the same [[temperature]] and [[pressure]])
4. {{lb|en|fluid mechanics|of a flow}} with a [[Mach number]] such that 0.3 < [[Ma]] < 0.8 (approximately - the exact limits vary between sources)

Noun

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

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.