1. (of speed) having or caused by speed approximately equal to that of sound in air at sea level
   - sonic

Encyclopedia: Transonic

• circumnavigator
• circumpolar
• circumscribe
• circumscribed
• circumscription
• circumspect
• circumspection
• circumspectly
• circumstance
• circumstances
• circumstantial
• circumstantial evidence
• circumstantiality
• circumstantially
• circumstantiate
• circumvallate
• circumvallation
• circumvent
• circumvention
• circumvolute
• circumvolution
• circumvolve
• circus
• circus acrobat
• Circus Aeruginosus