intersonic

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It's a recognised English word, but it isn't in the official NASPA Scrabble word list.

Definition of intersonic

1 sense · 1 part of speech · etymology included

adj

(not-comparable)Having a speed between that of the dilational wave and the shear wave

“We demonstrate that if the coefficient of friction is high enough, the sliding localizes within stick-slip pulses, which transform into opening waves propagating at intersonic speed in the direction of sliding or, for high Poisson's ratios, at supersonic speed in the opposite one.”

Definitions from Wiktionary, CC BY-SA.

From inter- + sonic.

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