hypersonic

[ hahy-per-son-ik ]

/ ˌhaɪ pərˈsɒn ɪk /

noting or pertaining to speed that is at least five times that of sound in the same medium.

Origin of hypersonic

First recorded in 1935–40; hyper- + sonic

Hypersonic weapons travel at extremely high speeds, anywhere from 3,840 to 16,250 miles an hour.

Death at Five Times the Speed of Sound |Kyle Mizokami |June 23, 2014 |DAILY BEAST
Unsurprisingly, Russia has started work on hypersonic weapons.

Death at Five Times the Speed of Sound |Kyle Mizokami |June 23, 2014 |DAILY BEAST
Hypersonic drones, like the drones before them, are the latest innovation in push-button warfare.

Death at Five Times the Speed of Sound |Kyle Mizokami |June 23, 2014 |DAILY BEAST
Hypersonic is the new supersonic, a frontier of speed dreamed of but not yet conquered.

Death at Five Times the Speed of Sound |Kyle Mizokami |June 23, 2014 |DAILY BEAST

Hypersonic weapons are the new arms race, with the United States, Russia, India and China all racing to develop them.

Death at Five Times the Speed of Sound |Kyle Mizokami |June 23, 2014 |DAILY BEAST

hypersonic

/ (ˌhaɪpəˈsɒnɪk) /

concerned with or having a velocity of at least five times that of sound in the same medium under the same conditions

hypersonics, noun

hypersonic

[ hī′pər-sŏn′ĭk ]

Relating to or capable of speeds equal to or exceeding five times the speed of sound (Mach 5 and above). Compare subsonic supersonic transonic.