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

Encyclopedia: Transonic

• issuer
• issuing
• Issus
• Istanbul
• isthmian
• Isthmian Games
• isthmus
• Isthmus of Corinth
• Isthmus of Darien
• Isthmus of Kra
• Isthmus of Panama
• Isthmus of Suez
• Isthmus of Tehuantepec
• Istiophoridae
• Istiophorus
• Istiophorus albicans
• Isuprel
• Isuridae
• Isurus
• Isurus glaucus
• Isurus oxyrhincus
• Isurus paucus
• Isère
• Isère River
• it