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The Clue

Jet speed units (5 letter answer)

The Answer

MACHS

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Notes

The answer MACHS is so rare that it appears less than once every 2500 puzzles.

Related Clues

Numbers named for an Austrian physicist

Definition

MACH as a noun:

1. (Mach, Ernst Mach) = Austrian physicist and philosopher who introduced the Mach number and who founded logical positivism (1838-1916)