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Adjective: subsonic  ,súb'só-nik
  1. (of speed) less than that of sound in a designated medium
    "aircraft flying at subsonic speeds"

Antonym: sonic, supersonic

Encyclopedia: Subsonic

Nearest

subsidized
subsidizer
subsidy
subsist
subsistence
subsistence farming
subsistent
subsister
subsoil
subsolar
subsonic
subspace
subspecies
substance
substance abuse
substance abuser
substandard
substantia alba
substantia grisea
substantia nigra
substantial