transonic

transonic [tran-son-ik] Word Origin adjective Chiefly Aeronautics.

1. close to the speed of propagation of sound; moving at 700–780 miles per hour (1127–1255 km/h) at sea level.

Also transsonic. Origin of transonic First recorded in 1940–45; trans- + sonic British Dictionary definitions for transonic transonic adjective

1. of or relating to conditions when travelling at or near the speed of sound

transonic in Science transonic [trăn-sŏn′ĭk]

1. Relating to or capable of speeds at or near the speed of sound (at or approaching Mach 1) or to aerodynamic conditions for bodies travelling at such speeds. Compare hypersonic subsonic supersonic.