This word is not acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. equal to, or greater than, or capable of achieving, ten times the speed of sound.

adj. far enough above the speed of sound so as to cause ionization of the air through shock heating deriving from the sonic shockwave, with resultant radio blackout, and plasma sheath surrounding the object travelling at speed

"But as new higher-speed concepts in what he calls the "plasmasonic" Mach 10 realm begin to appear, the phenomenon is attracting more attention."

subsonic    hypersonic    transonic    supersonic