Crossword Helper

The Clue

Sonic-speed unit (4 letter answer)

The Answer

MACH

Tags

Notes

The answer MACH is uncommon, appearing about once every 375 puzzles.

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Airspeed number
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Word with wave or number
Austrian physicist: 1838-1916
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Name often followed by a number
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Word before 1 or 2
Word often followed by a numeral

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)